Solved Questions on Decimals
1. The product of the two numbers is 18.585. If one number is 5.9, what is the other number?
a) 3.05
b) 3.15
c) 3.25
d) 3.95
Answer: b) 3.15
Explanation: Product of the two numbers = 18.585
One number = 5.9
Other number = 18.585 ÷ 5.9 = 3.15
2. The fat content is 213 grams in one kilogram of pure milk. What is the fat content in 195 kilograms of milk?
a) 41 kg 235 g
b) 41 kg 335 g
c) 41 kg 435 g
d) 41 kg 535 g
Answer: d) 41 kg 535 g
Explanation: Fat content in 1 kilogram of pure milk = 213 g ÷ 1000 = 0.213 kg
Fat content in 195 kilograms of milk = (195 × 0.213) kg
= 41.535 kg
= 41 kg + 0.535 kg
= 41 kg + (0.535 × 1000) g
= 41 kg + 535 g
= 41 kg 535 g
3. Billy purchased 5 litres of 400 millilitres of mustard oil, 2 litres of 20 millilitres of soya bean oil and 10 litres of 850 millilitres of sunflower oil. What is the total volume of his purchases?
a) 18 L 070 mL
b) 18 L 270 mL
c) 18 L 470 mL
d) 18 L 670 mL
Answer: b) 18 L 270 mL
Explanation: Quantity of mustard oil Billy purchased = 5 L 400 mL
= 5 L + 400 mL
= 5 L + (400/1000) L
= 5 L + 0.4 L
= 5.4 L
Quantity of Soya bean oil Billy purchased = 2 L 20 mL
= 2 L + 20 mL
= 2 L + (20/1000) L
= 2 L + 0.02 L
= 2.02 L
Quantity of sunflower oil Billy purchased = 10 L 850 mL
= 10 L + 850 mL
= 10 L + 850 mL
= 10 L + (850/1000) L
= 10 L + 0.85 L
= 10.85 L
Total volume of his purchases = (5.4 + 2.02 + 10.85) L
= (5.400 + 2.020 + 10.850) L
= 18.270 L
= 18 L + 0.270 L
= 18 L + (0.270 × 1000) mL
= 18 L + 270 mL
= 18 L 270 mL
Addition is shown as:
4. If the bags of Mark Cope and Carlo Moss weigh 5.2 kilograms and 4.832 kilograms, respectively, what is the difference in weight between their bags?
a) 268 grams
b) 286 grams
c) 368 grams
d) 386 grams
Answer: c) 368 grams
Explanation: Weight of bag of Mark Cope = 5.2 kg
Weight of bag of Carlo Moss = 4.832 kg
Difference in weight between their bags = (5.2 − 4.832) kg
= (5.200 − 4.832) kg
= 0.368 kg
= (0.368 × 1000) g
= 368 g
Subtraction is shown as:
5. Which of the following statements represent the decimal number 37.039 in words?
a) Thirty-seven point thirty-nine
b) Thirty-seven-point ninety-three
c) Thirty-seven point zero three nine
d) Thirty-seven point zero nine three
Answer: c) Thirty-seven point zero three nine
Explanation: Statement in words for the decimal number 37.039 is thirty-seven point zero three nine.
