Add a single digit to any 3-digit number (no help)

Add a single digit to a 3-digit number crossing the tens boundary.

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Add a single digit to a 3-digit number with base 10 blocks, not crossing the tens boundary.

Add mentally a single digit to a 3-digit number.

Add mentally a single digit to a 3-digit number, not crossing the tens.

Add mentally a single digit to a 3-digit number.

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