Page 77 - Mathematics_Std_4

Solution
(a) Mass of rice = 54 kg
Mass of wheat = 49000 g
Convert the mass of the sack of rice into kilograms as follows.
FOR ONLINE READING ONLY
1 kg = 1000 g
×
54 kg = 54 1000 g
= 54000 g
The sack of rice weighs 54000 g while that of wheat weighs
49000 g. Therefore, the sack of rice is heavier than that of
wheat.

(b) The difference in their masses is 54000 g − = 49000 g 5000 g.

Therefore, the difference in mass is 5000 g.

Exercise 9

1. Which is heavier between 2,000 g of salt and 20 kg of
cotton?

2. A fisherman caught fish weighing 3 kg and 500 g. What is
the mass of the fish in grams?

3. Elia weighs 32 kg, Zawadi weighs 300 hg and Furaha
weighs 30,750 g.
(a) Who has the greatest mass?

(b) Find the difference in mass between Elia and Furaha in
grams.

4. Buholo bought 2 kg of millet flour, 1 kg of sugar, and 500 g
of powdered milk. How many grams of items did she buy?

5. Find the total mass of five loaves of bread in grams if each
loaf has a mass of half a kilogram.

6. The mass of a chicken is 3 kg. After preparing it for cooking,
its mass was 2 kg 750 g. How many grams did its mass
decrease? Give reasons for the decrease in mass.

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06/11/2024 17:17:13
MATHEMATICS STD 4 PB 2024.indd 70
MATHEMATICS STD 4 PB 2024.indd 70 06/11/2024 17:17:13