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E:\Working\Focus_Learning\Math_Genius_3_(11-09-2024)\Open_Files\CHAP_02
\ 12-Sep-2024 Surender Prajapati Proof-4 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 the information given on the previous page and find the total number of plants
planted by the school this year.

Addition

In class II, you learned 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 the way to make addition easy.
example: add 145 and 512.

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

into hundreds, tens and H t O H t O H t O
ones.
100 40 5 100 40 5 100 40 5
145 100 + 40 + 5 + 500 10 2 + 500 10 2 + 500 10 2
512 500 + 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