Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 How many grams are there in 2 kg?
Show worked solution
2 × 1000 = 2000 g.
2 How many grams are there in half a kilogram?
Show worked solution
Half of 1000 g is 500 g.
3 Five apples weigh 120 g each. What is their total mass in grams?
Show worked solution
5 × 120 = 600 g.
Level 2 · Core
4 A bag of flour is 1 kg 250 g. How many grams is that altogether?
Show worked solution
1 kg is 1000 g, plus 250 g makes 1250 g.
5 Which is heavier: 900 g or 1 kg?
Show worked solution
1 kg is 1000 g, which beats 900 g, so 1 kg is heavier.
6 A parcel weighs 2500 g. Write that in kilograms and grams.
Show worked solution
2500 g is two lots of 1000 g with 500 g left, so 2 kg 500 g.
Level 3 · Challenge
7 An empty box weighs 400 g. Eight tins of 250 g are packed into it. What is the total mass in kilograms and grams?
Show worked solution
Tins: 8 × 250 = 2000 g. With the box: 2400 g, which is 2 kg 400 g.
8 A suitcase limit is 20 kg and yours weighs 17 kg 600 g. How many more grams can you pack?
Show worked solution
20 kg is 20000 g and the case is 17600 g, so 20000 − 17600 = 2400 g.
9 Six identical books weigh 3 kg altogether. How many grams does one book weigh?
Show worked solution
3 kg is 3000 g, and 3000 ÷ 6 = 500 g each.
⭐ Bonus Challenge · only if the rest felt easy
10 An empty box weighs 350 g. You pack 6 tins of 400 g each into it. What is the total mass? (type like 2kg750g)
Show worked solution
Tins: 6 × 400 = 2400 g. With the box: 2400 + 350 = 2750 g. Since 1000 g = 1 kg, that is 2 kg 750 g.