Number Knowledge

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Welcome to Class 1 Number Knowledge lesson plan

Learning Objectives

1. Read, write and recall numbers (cardinal numbers) from 0 to 120
2. Understand partitioning of numbers (introduction to place values)
3. Counting forwards and backwards
4. Know the position of numbers (ordinal numbers)
5. Comparing two 2-digit numbers
6. Recognize odd and even numbers (0 to 50)
7. Understanding Bhutasankhya sytem

Introduction

Now that we know the importance of mathematics, let us learn to apply counting and calculations in our daily lives. First, we shall recall the numbers learnt till now and practice writing numbers.

Numbers	Word Forms	Numbers	Word Forms
१	एकम्	११	एकादश
२	द्वे	१२	द्वादश
३	त्रीणि	१३	त्रयोदश
४	चत्वारि	१४	चतुर्दश
५	पञ्च	१५	पञ्चदश
६	षट्	१६	षोडश
७	सप्त	१७	सप्तदश
८	अष्ट	१८	अष्टादश
९	नव	१९	नवदश
१०	दश	२०	विंशतिः

Practice Writing

See the end of this chapter for more practice sheets.

Activity: Find the 10s

Number exercise: Partitioning a 2-digit number.

Draw a line around 10 items and write the remaining numbers as shown in the example.

15 = 10 and 5	18 = _____ and _____
19 = _______ and _______	20 = _______ and _______
13 = _______ and _______	11 = _______ and _______
12 = _______ and _______	14 = _______ and _______

Activity : Expanded forms of Numbers

Number Exercise: Partitioning a 2-digit number (20 to 99) An introduction to place-value system

Write each number identifying the number of groups of 10s

34 has 30 and 4	78 has 70 and 8	91 has ______ and ______
47 has ______ and ______	71 has ______ and ______	40 has ______ and ______
63 has ______ and ______	98 has ______ and ______	39 has ______ and ______
76 has ______ and ______	81 has ______ and ______	53 has ______ and ______
33 has ______ and ______	41 has ______ and ______	59 has ______ and ______
Write the missing number
99 has 90 and 9	36 has 30 and 6	85 has ______ and 5
66 has 60 and ______	______ has 20 and 8	43 has ______ and 3
______ has 20 and 4	67 has 60 and ______	______ has 80 and 8

Activity: Identifying and writing expanded forms

Number Exercise: Writing expanded forms (75 to 120)

One stack here has 10 blocks. There are 10 blocks below. How many stacks and blocks are needed for the following numbers. Find the missing spots.
76	Seventy - six	Seven Stacks and Six Blocks
119	_______________	Ten Stacks and Nineteen Blocks
	Ninety - five	________ Stacks and ________ Blocks
110	One hundred ten	________ Stacks and ________ Blocks
107	_______________	________ Stacks and ________ Blocks
120	_______________	________ Stacks and ________ Blocks
	One hundred fourteen	________ Stacks and 4 Blocks
87	_______________	8 Stacks and ________ Blocks
102	_______________	________ Stacks and ________ Blocks
90	_______________	________ Stacks and ________ Blocks

Activity: Count forward and backward (1s, 2s, 3s, 5s)

Number Exercise: Count forward and backward 50 to 99 (by 1s, 2s, and 3s).

Count forward by 1 and colour that flower yellow. Count backward by 2 and colour that flower red. Write all the numbers in the line given below.

Count by 3 and circle the numbers starting from 1. Join the circled numbers. Colour the picture yellow.

Count by 5 and colour that box red. Count by 10 and colour that box yellow.

5	10	15	20	25	30	35	40	45	50
23	28	33	38	43	48	53	58	63	68
36	41	46	51	56	61	66	71	76	81
17	22	27	32	37	42	47	52	57	62

Activity: How many of a Total

Number Exercise: Knowing how many in a total number.

Color as many things to match the number given in the box and write the total number on the line given below.

Color 6 out of __________ birds	Color 8 out of __________ hens
Color 8 out of __________ bananas	Color 12 out of __________ oranges
Color 11 out of __________ bees	Color 10 out of __________ insects
Color 5 out of __________ lotuses	Color 9 out of __________ flowers
Color 4 out of __________ purses	Color 5 out of __________ photoframes
Color 17 out of __________ pencils	Color 13 out of __________ brinjals

Cardinal and Ordinal Numbers

A cardinal number defines how many (number) of something are present. Example, my friend's house is 4 (four) houses away from my house.

An ordinal number defines where (position) is something located in a list. Example, my friend’s house is the fourth building from my house.

So, if we say there are five persons standing in the line in a bank and the fifth person is wearing a blue shirt, we are

• counting the number of persons, seen standing in a line
• identifying the position of a particular person

Activity: My Train Ride

Number Exercise: Using the cardinal word forms and Ordinal numbers.

During the summer holidays, I went to Manguluru from Bengaluru by a train. The engine is the ___________ (1) and the foremost carriage of the train. My mother told me that a train also has cars in which we all travelled. The engine of our train was very strong. It pulled our long train having _________(18) cars easily even in uphill places. Our car was in the middle, _________ (9) from the engine. I sat by the window and was counting the trains and the number of cars they had. The ______(3) train that sped by us was very long having _________ (22) cars. I was surprised to see that the _________ (6) car of a train standing in a station had the words “Medical Van” written on it. It started to move when the guard waved a green flag standing on the _______ (7) car which was also the train’s last car. 

It was fun walking along with my father in a moving train crossing __________ (5) cars to reach the __________ (4) car. It was the food or the pantry car. As the train took a bend in the hills, I saw that the ladies’ car was just _________ (2) cars away from the engine. Our car was followed by three air-conditioned cars which were in __________ (10), ___________ (11) and ____________ (12) places away from the engine. When I got off the train at Manguluru, as I walked towards the station, I saw the railway porters unloading many things from two cars in the rear. They were the ___________ (16) and _________ (17) cars. It was a joyous train ride and I was looking forward to visit my grandparents.

Activity: Pick a sweet mango

Number Exercise – Sorting, Ordinal numbers till 50, Making a number chart

Lakshmi likes sweet mangoes. So, her mother went to the wholesale market to buy mangoes for her to distribute to her friends on her birthday. She knew that ripe mangoes are yellow in color and they are sweet. Lakshmi’s mother wanted to make some mango pickle so she chose unripe mangoes from the carts. From the top row tell the number and position of the ripe and unripe mangoes.

Ripe Mangoes		Unripe mangoes
Cardinal	Ordinal	Cardinal	Ordinal

Odd and Even Numbers

Let’s talk about sharing now. Rama visited an orange farm when he went to his grandparents’ home. He brought 15 oranges home. And he wondered what he would do with so many oranges…

So, he decided to share them with his friends. He wanted to give the same number of oranges to both his friends.  

Don’t we all share with whom we care for.