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\ 03-Oct-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

Practice time 3F

1. Add the following. One has been done for you.

(a) 6 + 3 + 2 = 11 (b) + + =

(c) + + = (d) + + =

(e) + + = (f) + + =

(g) + + = (h) + + =

2. Add.

(a) 1 (b) 3 (c) 4 (d) 7 (e) 3

6 4 2 1 8

+ 3 + 7 + 5 + 8 + 2

Adding 2-digit And 1-digit numbers

There were 12 pencils in a drawer. Hazel puts 7 more pencils in the drawer. How

many pencils are there in total?

12 is a 2-digit number and 7 is a 1-digit number.

To add the numbers 12 and 7, we follow these steps.
Step 1. Write the numbers one below Step 2. Add the tens.

the other. tens Ones

first add the ones. 1 2

tens Ones + 7
1 2 1 9
+ 7
9

There is no tens digit in the
second number.

2 ones + 7 ones = 9 ones So, write 1 in the tens place.

Write 9 in the ones place. Thus, 12 + 7 = 19.

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