1. The mass of a durian is 900 g. The mass of a papaya is 550 g.
(a) Which is heavier, the durian or the papaya?
(b) How much heavier?
The durian is heavier.
900 – 550 = 350
The durian is 350 g heavier.
900 g
550 g
?
Durian
Papaya

2. The mass of Sulin is 34 kg. Her brother is 8 kg lighter than she.
(a) What is the mass of her brother?
(b) What is the total mass of Sulin and her brother?
34 kg
?
8 kg
Sulin
Brother
34 - 8 = 26
The mass of her brother is 26 kg.
34 + 26 = 60
Their total mass is 60 kg.

3. The mass of Raju is 39 kg. His father is 28 kg heavier than he.
(a) Find the mass of Raju’s father.
(b) What is the total mass of Raju and his father?
39 + 28 = 67
The mass of Raju’s father is 67 kg.
39 + 67 = 106
Their total mass is 106 kg.
39 kg
?
28 kgRaju
Father

4. The total mass of an apple and a pineapple is 840 g. The
mass of the apple is 90 g.
(a) Find the mass of the pineapple.
(b) How much heavier is the pineapple than the apple?
840 – 90 = 750
The mass of the pineapple is 750 g.
750 – 90 = 660
The pineapple is 660 g heavier than the apple.
90 g
?
Apple
Pineapple
840 g
?