Page 32 - Math Genius C3

E:\Working\Orange_Education\Math_Genius_3\Open_Files\CHAP_02
\ 03-Oct-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

1. Add the following.

(a) H T O (b) H T O (c) H T O (d) H T O

8 5 6 4 6 4 2 1 8 0
+ 4 3 + 2 7 1 + 6 4 + 2 5 9

2. Refer to the information given on the previous page and find the total number of
plants the school has planted this year.

Addition

In class II, you learnt how to add 2-digit H T O
and 3-digit numbers. 3 4 2

Let us revise the terms of addition while + 4 5 6 Addends (numbers that are added)
adding numbers. 7 9 8 Sum (answer of addition)

Addition By ExpAnding thE AddEnds

Let us explore an easy way to add numbers.
Example: Add 145 and 512.

Solution:
Step 1: Expand both the addends Step 2: Add the Step 3: Add the Step 4: Add the

into hundreds, tens and ones. tens. hundreds.
ones. H T O H T O H T O

145 100 + 40 + 5 100 40 5 100 40 5 100 40 5
512 500 + 10 + 2 + 500 10 2 + 500 10 2 + 500 10 2

7 50 7 600 50 7
Since 600 + 50 + 7 = 657, the sum of 145 and 512 is 657.

practice time 2A

1. Find the sum of the following.

(a) H T O (b) H T O (c) H T O (d) H T O
2 1 7 4 8 7 5 5 5 2 3 4
+ 3 4 2 + 1 1 1 + 1 3 1 + 5 1 1

30 Mathematics-3