Page 186 - ICSE Math 4

Growing and reducing pa erns may not have a fi xed unit of repeat.
Rules to Extend a Growing or Reducing Pattern

There are some rules to extend a growing pa ern or reducing pa ern. Some of the rules
are men oned below.

On a number line

Skip count on a number line to extend a growing or reducing pa ern. Look at the given
number line to understand this.

5 10 15 20 25 30 35 40 45 50 55 60 65 70

To extend the growing pa ern in the above number line, the rule is to start from 5 and skip
count by 10 in forward direc on. Similarly, to extend the reducing pa ern in the number
line, the rule is to start from 65 and skip count by 10 in backward direc on.

Use of hundreds chart Hundreds Chart
Growing pa ern (+1)
For each row from le to right, the numbers
increase by 1 and from right to le , they 1 2 3 4 5 6 7 8 9 10
decrease by 1. 11 12 13 14 15 16 17 18 19 20

For each column from top to bo om, the 21 22 23 24 25 26 27 28 29 30
numbers increase by 10 and from bo om ern (+10) 31 32 33 34 35 36 37 38 39 40 ern (–10)
to top, they decrease by 10. 41 42 43 44 45 46 47 48 49 50

Diagonally, the numbers from le to right Growing pa 51 52 53 54 55 56 57 58 59 60 Reducing pa
increase by 11 (shown in yellow colour) 61 62 63 64 65 66 67 68 69 70
and from right to le , they increase by 71 72 73 74 75 76 77 78 79 80
9 (shown in blue colour). 81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100

Using pictures Reducing pa ern (–1)

Look at the given pa ern of leaves to see how a pa ern grows or reduces.
Growing pa ern 

Reducing pa ern

Star ng from le to right, the number of leaves is increasing by 1 while from right to le ,
the number of leaves is decreasing by 1.

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