Lesson 3 of 8 · Grades 3 to 5
Practice: Mass and weight
Ten questions on mass and weight: changing between grams and kilograms and between ounces and pounds, comparing masses and choosing a sensible unit.
How to use this page
This page gives you ten more questions on the same idea as the lesson "Mass and weight". Work through them at your own speed. Write your answer down or say it out loud before you open the answer box, so you give yourself a real chance to think.
If a question feels hard, go back to the lesson and look at the worked example again. Getting a question wrong is useful; it shows you the part that needs one more look.
Practice questions
Answer all ten questions in your notebook or in your head. Then open each answer to check your work.
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How many grams are in 4 kilograms?
Show answer
4,000 grams. 4 × 1,000 = 4,000 g.
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How many ounces are in 2 pounds?
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32 ounces. 2 × 16 = 32 oz.
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A box has a mass of 1,500 g. Write that in kilograms and grams.
Show answer
1 kg 500 g. 1,500 g is 1,000 g plus 500 g.
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Which is heavier, 700 g or 2 kg?
Show answer
2 kg. It is 2,000 g, which is heavier than 700 g.
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A bag of apples weighs 4 lb. How many ounces is that?
Show answer
64 ounces. 4 × 16 = 64 oz.
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A bike has a mass of 12 kg. How many grams is that?
Show answer
12,000 grams. 12 × 1,000 = 12,000 g.
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A parcel weighs 40 oz. Write that in pounds and ounces.
Show answer
2 lb 8 oz. 40 oz is 32 oz plus 8 oz.
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Which is lighter, 3 kg or 2,800 g?
Show answer
2,800 g. It is 2.8 kg, which is lighter than 3 kg.
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A kitten weighs 2 lb 4 oz. How many ounces is that?
Show answer
36 ounces. 2 lb is 32 oz, and 32 + 4 = 36 oz.
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A bag of flour has a mass of 2,500 g. Write that in kilograms and grams.
Show answer
2 kg 500 g. 2,500 g is 2,000 g plus 500 g.