Grade 1Counting & Place Value

1.NBT.C.5

Add or take away 10 in your head — only the tens digit changes.

Worksheets for this standard 1 topic

10 More, 10 Less (Missing Numbers)1 way

The standard, officially

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

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