Page 125 - Start Up Mathematics_5

3. Measure the length of the given lines and add.

(a) (b)

cm + cm = cm cm + cm = cm

(c)

cm mm + cm mm = cm mm

Multiplication and Division of Metric Measures

Example 19: Multiply 36 m 21 cm by 15. Example 20: Multiply 8 kg 65 g by 34.

Solution: 36 m 21 cm = 36.21 m Solution: 8 kg 65 g = 8.065 kg
3 1 1 1
3 6 . 2 1 2 2
× 1 5 8 . 0 6 5
1 × 3 4
1 8 1 0 5 1 1
+ 3 6 2 1 0 3 2 2 6 0
5 4 3 . 1 5 m + 2 4 1 9 5 0
2 7 4 . 2 1 0 kg

Example 21: Divide 46 L 150 mL by 25.

Solution: 46 L 150 mL = 46.150 L
1 . 8 4 6
25 4 6 . 1 5 0 Remember
– 2 5 ↓ To multiply or divide, first
2 1 1 convert the given measure
– 2 0 0 in decimals.
1 1 5
– 1 0 0
1 5 0
– 1 5 0

0
So, 1.846 L = 1 L 846 mL.

A Challenge!

(a) Convert 68 dam 46 m to cm and divide by 18.
(b) Convert 42 g to dg and multiply by 39.

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