What preskill is required for solving subtraction problems that involve zeros? When is this preskill taught?
What will be an ideal response?
A preskill for solving subtraction problems that require renaming when zeros are involved is learning the tens-numbers-minus-one facts (60 – 1, 90 – 1, 40 – 1). This preskill is introduced about a week prior to introducing subtraction problems that require renaming when zeros are involved.
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