Question
Adam has 40 cm of thread.
He uses 30 cm of thread.
He cuts the remaining thread into length of 10 cm each.
How many 10-cm pieces of threads are there?
4 m

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Adam has 40 cm of thread.
He uses 30 cm of thread.
He cuts the remaining thread into length of 10 cm each.
How many 10-cm pieces of threads are there?