Addition of 2 and 3-digit numbers

WEEK 5

Topic: Addition

Subtitle: Addition of 2 and 3-digit numbers

Objectives: At the end of this lesson, pupils should be able to:

1. add 2digit numbers

2. add 3 numbers taking two at a time

CONTENT  

Addition of 2-digit numbers with renaming

Addition of 2-digit numbers with renaming is solved by using:

• the expanded method and,

• the direct or short method.

 

Addition using a direct method or shortcut

 

1. 73 + 37

  7  3

+3  7

  110

 

2. 54 + 23

 

  5  4

+2  3

  7  7

 

Addition of 3 numbers

1. 359 = 300 + 50 + 9

3. 914 = 900 + 10 + 4
4. 800 + 40 + 2 = 842
5. …