Page 63 - Start Up Mathematics_5

16
1

For example, rectangles with 4
dimensions 1 × 16, 2 × 8, 4 × 4. 2

So, the factors of 16 are 1, 2, 4, 8 8
and 16. 4

3. Similarly to find the factors of 18, draw all possible rectangles using 18 squares. Colour
these rectangles yellow.

4. To find the HCF of 16 and 18, compare the sides of red and yellow rectangles to find
the equal sides. Equal sides show the common factor. So, 1 is a common factor.

1
16

1
18

5. Find out all the common factors. The highest factor among the common factors is the
required HCF.
So, the HCF of 16 and 18 is _________.

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