Conversions | Math Olympiad for Class 5 PDF Download

Q1. A rope is 3.5 kilometers long. How many meters is this?
(a) 350 meters
(b) 3,500 meters
(c) 35 meters
(d) 3,000 meters

Ans: (b) 3,500 meters

1 kilometer = 1,000 meters. So, 3.5 km × 1,000 = 3,500 meters.

Q2. A bag of rice weighs 2.8 kilograms. How many grams is this?
(a) 280 grams
(b) 2,800 grams
(c) 28 grams
(d) 2,000 grams

Ans: (b) 2,800 grams

1 kilogram = 1,000 grams. So, 2.8 kg × 1,000 = 2,800 grams.

Q3. A movie lasts 1 hour and 45 minutes. How many minutes is this in total?
(a) 105 minutes
(b) 90 minutes
(c) 75 minutes
(d) 120 minutes
Ans: (a) 105 minutes

1 hour = 60 minutes. So, (1 × 60) + 45 = 60 + 45 = 105 minutes.

Q4. If 1 USD = 83 INR, how many rupees will you get for 25 USD?
(a) 2,075 INR
(b) 2,000 INR
(c) 1,875 INR
(d) 2,150 INR
Ans: (a) 2,075 INR

To convert USD to INR, multiply by the exchange rate: 25 × 83 = 2,075 INR.

Q5. A toy costs 450 paise. How many rupees is this?
(a) 4 rupees
(b) 4.5 rupees
(c) 45 rupees
(d) 5 rupees
Ans: (b) 4.5 rupees

1 rupee = 100 paise. So, 450 paise ÷ 100 = 4.5 rupees.

Q6. A dog weighs 12 pounds. How many ounces is this?
(a) 180 ounces
(b) 192 ounces
(c) 160 ounces
(d) 200 ounces
Ans: (b) 192 ounces

1 pound = 16 ounces. So, 12 × 16 = 192 ounces.

Q7. Convert 3/4 to a decimal.
(a) 0.75
(b) 0.34
(c) 0.7
(d) 0.8
Ans: (a) 0.75

To convert a fraction to a decimal, divide the numerator by the denominator: 3 ÷ 4 = 0.75.

Q8. A game lasts 300 seconds. How many minutes is this?
(a) 4 minutes
(b) 5 minutes
(c) 6 minutes
(d) 3 minutes
Ans: (b) 5 minutes

1 minute = 60 seconds. So, 300 seconds ÷ 60 = 5 minutes.

Q9. Convert 5/6 to a percentage.
(a) 83.33%
(b) 50%
(c) 66.67%
(d) 80%
Ans: (a) 83.33%

To convert a fraction to a percentage, multiply by 100: 5/6 × 100 = 500/6 ≈ 83.33%.

Q10. Convert 13/4 to a mixed number.
(a) 3 whole 1/4
(b) 2 whole 3/4
(c) 4 whole 1/4
(d) 3 whole 3/4
Ans: (a) 3 whole 1/4

Divide the numerator by the denominator: 13 ÷ 4 = 3 (whole number) with a remainder of 1, so it’s 3 1/4.