Numeracy

finding the difference :

Najwa can you complete the following examples:

9-4
11-7
14-9
17-11
20-15

harder if you are confident:

34-23
49-32
88-76
92-80
99-90

using a number line or 100 square they should start from the smallest number
and count how many jumps it takes to get to the bigger number, the number of jumps
is the answer. good luck....