Page 109 - Viva

(c) (d)

4. If you pour all the water from a steel glass into a plastic cup, will the volume of
water change? Does it show conservation of volume?

Addition and Subtraction

Length

Example 5: Add 25 m 32 cm and Example 6: Subtract 117 m 54 cm from
16 m 8 cm. 183 m 21 cm.

Solution: m cm Solution: m cm
1 1 12 11
2 5 3 2 7 2 1 11

+ 1 6 0 8 1 8 3 2 1
4 1 4 0 – 1 1 7 5 4
6 5 6 7

Example 7: Add 125 km 350 m and Example 8: Subtract 9 km 150 m from
18 km 210 m. 15 km.

Solution: km m Solution: km m
1 14 11
1 2 5 3 5 0 0 4 10 10

+ 1 8 2 1 0 1 5 0 0 0
1 4 3 5 6 0 – 9 1 5 0
5 8 5 0

Weight

Example 9: Add 313 kg 150 g and Example 10: Subtract 15 kg 65 g from
225 kg 375 g. 36 kg 125 g.

Solution: kg g Solution: kg g

1 0 12
3 1 3 1 5 0 3 6 1 2 5
+ 2 2 5 3 7 5 – 1 5 6 5

5 3 8 5 2 5 2 1 0 6 0

99