Number and operations in base ten
1.NBT.C.4
Add within 100, including a two-digit number plus a one-digit number or a multiple of 10.
Practice for this standard
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Addition
Sums within 10 through multi-digit column addition with regrouping, plus the fact fluency underneath.
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Place value
Tens and ones through millions and thousandths, expanded form, and reading numbers out loud correctly.
Official wording and the full standard: CCSS.MATH.CONTENT.1.NBT.C.4