Page 178 - Math Genius C4

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Solution: Total weight of three friends = 108 kg

Rohan’s weight = 37 kg 250 g
Rehan’s weight = 38 kg 550 g

Total weight of Rohan and Rehan = 37 kg 250 g + 38 kg 550 g = 75 kg 800 g

So, Vivan’s weight = 108 kg – 75 kg 800 g = 32 kg 200 g
Thus, Vivan’s weight is 32 kg 200 g.

Challenge Question Critical Thinking
You have a balance scale. On one side, you place 2 kg 450 g of apples. On the other
side, you place a block of cheese that weighs 1 kg 800 g and some grapes. The scale is perfectly
balanced. Can you figure out how much the grapes weigh? Now, if you eat 250 g of grapes,
how much more (in kilograms and grams) do you need to add to make the scale balance again?

Practice time 9d

1. Solve the following.

(a) kg g mg (b) kg g mg
3 4 3 5 5 0 3 5 6 6 0 0 5 4 0 0 8 3

+ 2 7 8 0 0 4 9 8 7 + 3 3 9 2 6 1 6 5 0

(c) kg g mg (d) kg g mg

4 0 8 3 1 0 5 0 0 7 0 0 8 4 1 3 0 0
– 1 4 5 6 7 5 3 9 5 – 3 2 4 5 4 9 2 9 0

2. Add the following measurements of weight.

(a) 38 kg 946 g and 22 kg 665 g

(b) 26 kg 430 g 400 mg and 27 kg 570 g 600 mg
(c) 35 kg 585 g 17 mg and 28 kg 894 g 8 mg

(d) 360 kg 870 mg and 140 g 550 mg
3. Subtract the following measurements of weight.

(a) 54 kg 20 g from 56 kg 36 g

(b) 580 kg 90 g 450 mg from and 620 kg 756 g 80 mg
(c) 18 kg 28 g 389 mg from 25 kg 40 g 90 mg

(d) 110 kg 67 g 860 mg from 350 kg 44 g 275 mg

176 Mathematics-4