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Grade 1

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1.NBT.C.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a...
1.NBT.C.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without having to...
1.NBT.C.6 Subtract multiples of 10 in the range 10–90 from multiples of 10 in the range 10–90...