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AMO · 2027 · Grades 2-3 · Self-study SET 25 Question 2

AMO

Question 2

Ten small ropes of equal length are knotted together to form a big rope 81 cm long. The question says the knotted area is 1 cm for every rope. How long is each small rope, in centimetres?

Use the source model: join the ten ropes end to end in one open chain; each join reduces the total length by 1 cm.

Question illustration

Enter one whole number, without units.