Page 101 - ICSE Math 1

Addition and
Addition and

6 Subtr
Subtraction up to 99action up to 99

Learning Outcomes

Students will be able to learn:

 to add 2-digit and 1-digit numbers.
 to add two 2-digit numbers.

 to add numbers on a number line.
 to subtract a 1-digit number from a 2-digit number.

 to subtract two 2-digit numbers.
 to subtract numbers on a number line.

 to apply addition and subtraction in day-to-day life.
 to solve day-to-day problems related to addition and subtraction of numbers.

We know about numbers up to 99. We also know that 10 is the smallest 2-digit
number and 99 is the largest 2-digit number. Now let’s see how can we add

and subtract 2-digit numbers.

Addition of 2-Digit and 1-Digit Numbers

Common Mistake!
Look at the given example. Always write the numbers in

Tens Ones Step 1: Add the ones and write their correct place.

2 3 the sum under ones. 3 0
3 + 4 = 7 + 4
+ 4
Step 2: Write the tens as it is. 7 0 ()
2 7

1. Add the given numbers.

Tens Ones Tens Ones Tens Ones Tens Ones
(a) (b) (c) (d)
6 2 5 1 3 3 7 0

+ 3 + 7 + 4 + 6

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