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 centimetres are there in 3 m?
Show worked solution
3 × 100 = 300 cm.
2 How many millimetres are there in 8 cm?
Show worked solution
8 × 10 = 80 mm.
3 A pencil is 15 cm long. How many millimetres is that?
Show worked solution
15 × 10 = 150 mm.
Level 2 · Core
4 A ribbon is 2 m 45 cm long. How many centimetres is that altogether?
Show worked solution
2 m is 200 cm, plus 45 cm makes 245 cm.
5 Which is longer: 1200 mm or 1 m?
Show worked solution
1200 mm is 120 cm and 1 m is 100 cm, so 1200 mm is longer.
6 A rope 5 m long is cut into pieces 50 cm long. How many pieces are there?
Show worked solution
5 m is 500 cm, and 500 ÷ 50 = 10 pieces.
Level 3 · Challenge
7 Three sticks measure 85 cm, 900 mm and 1 m. Which is longest?
Show worked solution
85 cm, 900 mm = 90 cm, and 1 m = 100 cm. The longest is 1 m.
8 A ribbon is 3 m long. You cut off four pieces of 65 cm each. How many centimetres are left?
Show worked solution
3 m is 300 cm. Four pieces take 4 × 65 = 260 cm, leaving 300 − 260 = 40 cm.
9 One piece of wood is 1 m 20 cm and another is 95 cm. How many centimetres longer is the first?
Show worked solution
1 m 20 cm is 120 cm, and 120 − 95 = 25 cm.
⭐ Bonus Challenge · only if the rest felt easy
10 A ribbon is 2 m long. You cut off three pieces, each 45 cm. How many centimetres are left?
Show worked solution
2 m = 200 cm. Three pieces take 3 × 45 = 135 cm. Left: 200 − 135 = 65 cm.