Study Guide 1/2 G05 ~ Mathematics
1
Unit
Counting with whole numbers In Grades 3 and 4, you learnt how to count with whole numbers. Do you still remember how to count in 2s? Let’s revise counting in 2s. When you count in 2s, always add 2 to the previous number to get the next number. +2
2
4
+2
6
+2
+2
8
10
+2
12
You may start with any number. Study the numbers. Do you see you can start at any number and count in whole numbers? +2
63
65
+2
67
+2
69
+2
71
+2
73
In the above examples, you counted on or forwards.
Using whole numbers, you can also count back or backwards. Study the numbers below and complete the missing numbers. Count back in 3s.
–3
53
–3
50
–3
–3
47
–3
41
17
–3
38
–3
32
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