Practice Units of weight
Mass is measured in units such as grams and kilograms.
Converting to a common unit helps you compare amounts and calculate quantities in recipes or deliveries.
Exercises with solutions
Weights are measured in grams, kilograms and tonnes. Here 1 kg = 1000 g and 1 t = 1000 kg. To convert to a smaller unit you multiply, to a larger unit you divide.
Exercise 1
How many grams are 2.5 kg?
Show solution and working
2,500 g
1 kg = 1000 g, so 2.5 · 1000 g = 2,500 g.
Exercise 2
How many kilograms are 4,200 g?
Show solution and working
4.2 kg
4,200 ÷ 1000 = 4.2 kg.
Exercise 3
A box weighs 3 kg plus 300 g of packaging. How heavy is everything in grams?
Show solution and working
3,300 g
3 kg = 3,000 g. Then 3,000 g + 300 g = 3,300 g.
Exercise 4
How many kilograms are 2 t?
Show solution and working
2,000 kg
1 t = 1000 kg, so 2 · 1000 kg = 2,000 kg.
Common mistake
Confusing tonnes and kilograms: one tonne is a thousand kilograms, not a hundred. Write the unit at every conversion.
Maths by grade
Keep learning with MatheJump
Create a free account and explore math practice. Choose from the available exercises to suit your learning needs.