Subtract from numbers up to 20 (timed)

Subtract a single digit from a 2-digit number up to 20.

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Subtract a single digit from a 2-digit number up to 20.

Subtract a single digit from a 2-digit number up to 20.

Subtract a single digit from a 2-digit number up to 20.

Find ten less with help of base 10 blocks.

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