To expand a number means, to change a number of a small size to a larger number.

EXAMPLES ARE AS FOLLOWS
Write the numbers below in an expanded form.

Write 15 in an expanded form; 10 + 5

23 ;20+ 3

48 ; 40 + 8

10 ; 10 +0

EXERCISE 
Expand the following numbers
1. 12 ; ___ + ___

2. 28 ; ___ + ____

3. 33 ; 30 +____

4. 39; ___+____