# Chapter 1 – Knowing Our Numbers

The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:

Introduction

Numbers are omnipresent, as they are fundamental topics that constitute the subjects of maths, physics, and chemistry. Numbers are the first things that we learn in our initial stages of our learning journey. They are classified into different types and kinds. You must have heard of odd and even numbers. Similarly, there are many types of numbers and numerous operations that we can perform on them. Before building the fortress of maths, let’s check the base of knowing our numbers.

#### What are Numbers?

Any mathematical object used to count, measure, and put abstract things in measurable format is a number. The basic counting consists of 10 numbers, from 0 to 9. These are 1, 2, 3, 4, 5, 6, 7, 8, and 9. Numbers form the base of counting and other mathematical operations.

Introduction to Comparing Numbers

We have so many numbers it is impossible to count. Positive numbers start from zero and go till infinity. However, there are many rules for comparing numbers. Let’s check some of those rules below:

Rule 1: Whichever number has more place values is greater. Suppose we take two numbers, 23 and 783. The 23 has place values up to tens, but 783 has place values up to hundreds, and hence 783 is larger than 23. But what if both the numbers have the same number of digits. How can we calculate which is greater at that time?

Rule 2: If both the numbers have the same number of digits, then we start comparing the digits of both from the highest place value till the one’s place. For example, if we have two numbers 245 and 225. In this, we start from hundreds of places and find that both are the same as 2. Now we go to the tens place and find that 4 is greater than 2. Hence 245 is greater than 225.

#### Numbering Orders

There can be two numbering orders based on the size of the numbers:

Ascending Order: When the number series has the smallest number initially, and the last number of that series is the highest, then we have the numbers in ascending order. The left number is always smaller or equal to the number on the adjacent right in ascending order.

Descending Order: When a series of numbers is formed in a manner that the first number is the highest and the last number is the smallest, then we have a descending order. In descending order series, the right number is always smaller than the left adjacent number. You can try these small and large numbers in practice for rearranging numbers.

For example, convert the data set of 34, 54, 22, 77, 64, 98, 23 and 12 in ascending and descending order.

According to the above definition, the ascending order is as follows:

12, 22, 23, 34, 54, 64, 77, 98

And the descending order would be:

98, 77, 64, 54, 34, 23, 22, 12

#### Use of Commas in Numbers

The basic purpose of commas in number systems is to ease the reading of numbers and their understanding. In the Indian system of numeration, we put commas at hundreds, ten thousand, ten lakhs, ten crores, and so on. The first comma is put after the three digits, and then comma comes after every two digits. For examples, check these numbers.

23,345

345

2,345

1,23,24,234

We can separate these examples using brackets. When we have multiple numbers, brackets are a good tool to separate them clearly.

#### Roman Numerals

In the Roman form of number representation, we use a mix of Latin alphabets and numbers. Some of the Roman numbers are given below:

 1 I 2 II 3 III 4 IV 5 V 6 VI 7 VII 8 VIII 9 IX 10 X

#### Conclusion

Knowing Our Numbers is an important chapter in maths NCERT since numbers can be found anywhere with various applications. For each profession, numbers mean different things. We can play with numbers by performing various operations and categorising them into certain categories based on any predefined definition. When we see clocks, the profit & losses of any business, the number of cakes that you want to eat are all specified with certain numbers.

#### FAQs

• What is playing with the numbers?

Playing with numbers is an NCERT maths chapter that deals with the basics of mathematics. It introduces the concept of numbers and their different properties.

• How can numbers be arranged?

Whenever we are given raw data sets containing numbers, it contains those numbers in unarranged form. To make things simple for understanding, we can simplify and arrange them in two patterns. One is ascending order, and the other is descending order.

• Why are roman numerals used?

A Roman numeral is a Latin form of number system that is used from conventional times. It has been used for centuries and hence is continuing now also for aesthetics.

• How many numbers are there?

On a number line, we can represent numbers, and there are infinite numbers. If we start from zero, we can have both positive numbers and negative numbers until infinity.

• Why are commas used in the numerical system?

Commas are meant to simplify the numerical understanding process. The first comma is put after the three digits at hundred places. After that, commas are put after every two digits to separate thousands, lakhs, crores and more.

• What operations can be performed on numbers?

We can perform various operations on numbers such as addition, subtraction, multiplication and division.

If you want to know more about this topic, then try MSVgo – the Math Science Super App that provides intuitive video explanations with simple examples of the topic. Your learning progress will be awesome with this learning platform.

### High School Physics

• Alternating Current
• Atoms
• Communication Systems
• Current Electricity
• Dual nature of Radiation and Matter
• Electric Charges and Fields
• Electricity
• Electromagnetic Induction
• Electromagnetic Waves
• Electrons and Photons
• Electrostatic Potential and Capacitance
• Fluid Pressure
• Force and Acceleration
• Force And Laws Of Motion
• Gravitation
• Internal Energy
• Kinetic Theory
• Law of motion
• Light – Reflection And Refraction
• Magnetic Effects Of Electric Current
• Magnetism and Matter
• Management Of Natural Resources
• Mechanical properties of Fluids
• Mechanical properties of Solids
• Motion
• Motion in a plane
• Motion in a straight line
• Moving Charges and Magnetism
• Nuclear Energy
• Nuclei
• Oscillations
• Our Environment
• Paths of Heat
• Physical world
• Ray optics and optical instruments
• Semiconductor Devices
• Semiconductor Electronics: Materials, Devices and Simple Circuits
• Simple Machines
• Sound
• Sources Of Energy
• Specific and Latent Heats
• Spherical Mirrors
• Static Electricity
• Systems of Particles and Rotational motion
• Thermal properties of matter
• Thermodynamics
• Units and Measurement
• Vectors, Scalar Quantities and Elementary Calculus
• Wave Optics
• Waves
• Work, Power and Energy

### High School Chemistry

• Acids, Bases and Salts
• Alcohols, Phenols and Ethers
• Aldehydes, Ketones and Carboxylic Acids
• Aliphatic and Aromatic Hydrocarbons
• Alkyl and Aryl Halides
• Amines
• Analytical Chemistry
• Atomic Structure
• Atoms And Molecules
• Basic concepts of Chemistry
• Biomolecules
• Carbon And Its Compounds
• Carboxylic acids and Acid Derivatives
• Chemical Bonding and Molecular Structures
• Chemical Energetics
• Chemical Equilibria
• Chemical Kinetics
• Chemical Reactions And Equations
• Chemical Reactions and Their Mechanisms
• Chemistry in Everyday Life
• Chemistry of p-Block elements
• Chemistry of Transition and Inner Transition
• Classification of Elements
• Coordination Compounds
• Cyanide, Isocyanide, Nitro compounds and Amines
• Electrochemistry
• Electrolysis
• Elements, Compounds and Mixtures
• Environmental Chemistry
• Equilibrium
• Ethers and Carbonyl compounds
• Haloalkanes and Haloarenes
• Hydrocarbons
• Hydrogen
• Ideal solutions
• Introduction to Organic Chemistry
• Ionic equilibria
• Matter
• Matter Around Us
• Matter In Our Surroundings
• Metallurgy
• Metals And Non-Metals
• Mole Concept and Stoichiometry
• Natural Resources
• Organic Chemistry – Basic Principles
• Periodic Classification of Elements
• Physical and Chemical Changes
• Physical and Chemical Properties of Water
• Polymers
• Preparation, Properties and Uses of Compounds
• Principles and Processes of Isolation of Elements
• Redox Reactions
• Relative Molecular Mass and Mole
• States of Matter
• Structure Of The Atom
• Study of Compounds
• Study of Gas Laws
• Study of Representative Elements
• Surface Chemistry
• The d-block and f-block elements
• The Gaseous State
• The p-Block Elements
• The Periodic Table
• The s-Block Elements
• The Solid State
• Thermodynamics

### High School Biology

• Absorption and Movement of Water in Plants
• Anatomy of Flowering Plants
• Animal Kingdom
• Bacteria and Fungi-Friends and Foe
• Biodiversity and Conservation
• Biofertilizers
• Biological Classification
• Biomedical Engineering
• Biomolecules
• Biotechnology and its Applications
• Biotic Community
• Body Fluids and Circulation
• Breathing and Exchange of Gases
• Cell – Unit of Life
• Cell Cycle and Cell Division
• Cell Division and Structure of Chromosomes
• Cell Reproduction
• Cellular Respiration
• Chemical Coordination and Integration
• Circulation
• Control And Coordination
• Crop Improvement
• Digestion and Absorption
• Diversity In Living Organisms
• Ecosystem
• Environmental Issues
• Excretory Products and their Elimination
• Flowering Plants
• Genes and Chromosomes
• Health and Diseases
• Health and Its Significance
• Heredity And Evolution
• Heredity and Variation
• How Do Organisms Reproduce?
• Human Diseases
• Human Eye And Colourful World
• Human Health and Disease
• Human Population
• Human Reproduction
• Hygiene
• Improvement In Food Resources
• Integumentary System- Skin
• Kingdom Fungi
• Kingdom Monera
• Kingdom Protista
• Life Processes
• Locomotion and Movement
• Microbes in Human Welfare
• Mineral Nutrition
• Molecular Basis of Inheritance
• Morphology of Flowering Plants
• Neural Control And Coordination
• Nutrition in Human Beings
• Organism and Population
• Photosynthesis
• Photosynthesis in Higher Plants
• Plant Growth and Development
• Plant Kingdom
• Pollination and Fertilization
• Pollution; Sources and its effects
• Principles of Inheritance and Variation
• Reproduction and Development in Angiosperms
• Reproduction in Organisms
• Reproductive Health
• Respiration in Human Beings
• Respiration in Plants
• Respiratory System
• Sexual Reproduction in Flowering Plants
• Strategies for Enhancement in Food Production
• Structural Organisation in Animals
• Structural Organisation of the Cell
• The Endocrine System
• The Fundamental Unit Of Life
• The Living World
• The Nervous System and Sense Organs
• Tissues
• Transpiration
• Transport in Plants

### High School Math

• Algebra – Arithmatic Progressions
• Algebra – Complex Numbers and Quadratic Equations
• Algebra – Linear Inequalities
• Algebra – Pair of Linear Equations in Two Variables
• Algebra – Polynomials
• Algebra – Principle of Mathematical Induction
• Binomial Theorem
• Calculus – Applications of Derivatives
• Calculus – Applications of the Integrals
• Calculus – Continuity and Differentiability
• Calculus – Differential Equations
• Calculus – Integrals
• Geometry – Area
• Geometry – Circles
• Geometry – Conic Sections
• Geometry – Constructions
• Geometry – Introduction to Euclid’s Geometry
• Geometry – Three-dimensional Geometry
• Geometry – Lines and Angles
• Geometry – Straight Lines
• Geometry – Triangles
• Linear Programming
• Matrices and Determinants
• Mensuration – Areas
• Mensuration – Surface Areas and Volumes
• Number Systems
• Number Systems – Real Numbers
• Permutations and Combinations
• Probability
• Sequence and Series
• Sets and Functions
• Statistics
• Trignometry – Height and Distance
• Trignometry – Identities
• Trignometry – Introduction

### Middle School Science

• Acids, Bases And Salts
• Air and Its Constituents
• Basic Biology
• Body Movements
• Carbon and Its Compounds
• Cell – Structure And Functions
• Changes Around Us
• Chemical Effects Of Electric Current
• Coal And Petroleum
• Combustion And Flame
• Components Of Food
• Conservation Of Plants And Animals
• Crop Production And Management
• Electric Current And Its Effects
• Electricity And Circuits
• Elements and Compounds
• Fibre To Fabric
• Food production and management
• Force And Pressure
• Forests: Our Lifeline
• Friction
• Fun With Magnets
• Garbage In, Garbage Out
• Getting To Know Plants
• Health and Hygiene
• Heat
• Hydrogen
• Life Processes: Nutrition in Animals and Plants
• Materials: Metals And Non-Metals
• Matter and Its States
• Metals and Non-metals
• Micro Organisms: Friend And Foe
• Motion And Measurement Of Distances
• Motion And Time
• Nutrition In Animals
• Nutrition In Plants
• Organization in Living Things
• Our Environment
• Physical And Chemical Changes
• Pollution and conservation
• Pollution Of Air And Water
• Reaching The Age Of Adolescence
• Reproduction In Animals
• Reproduction In Plants
• Respiration In Organisms
• Rocks and Minerals
• Separation Of Substances
• Simple Machines
• Soil
• Some Natural Phenomena
• Sorting Materials Into Groups
• Sound
• Stars And The Solar System
• Structure of Atom
• Synthetic Fibers And Plastics
• The Living Organisms And Their Surroundings
• Transfer of Heat
• Transformation of Substances
• Transportation In Animals And Plants
• Universe
• Waste-water Story
• Water: A Precious Resource
• Weather, Climate And Adaptations Of Animals To Climate
• Winds, Storms And Cyclones

### Middle School Math

• Area and Its Boundary
• Boxes and Sketches
• Data Handling
• Fun With Numbers
• Heavy and Light
• How Many
• Long And Short
• Mapping
• Measurement
• Money
• Multiplication and Factors
• Multiply and Divide
• Numbers
• Parts and Wholes
• Pattern Recognition
• Patterns
• Play With Patterns
• Rupees And Paise
• Shapes And Angles
• Shapes And Designs
• Shapes and Space
• Similarity
• Smart Charts
• Squares
• Subtraction
• Tables And Shares
• Tenths and Hundredths
• Time