Page 90 - Start Up Mathematics_1

(d) 14 17

(e) 16 18 20

(f) 8 10 14

Backward Counting 14

Counting backwards is like going down the 13

stairs and counting from the biggest to the 12
smallest.

For example, 14, 13, 12, 11, 10 11
10
15 Fill in the missing numbers.

(a) 15 13 10

(b) 17 16 13

(c) 18 16 14

(d) 20 17

Ordering

In increasing order, we arrange numbers from smallest to biggest.

In decreasing order, we arrange numbers from biggest to smallest.

For example, 13, 15, 16, 19 are in increasing order

18, 14, 12, 10 are in decreasing order

Quick Tip

Increasing order → small < big < bigger < biggest

Decreasing order → big > small > smaller > smallest

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