Number and operations in base ten
1.NBT.C.6
Subtract multiples of 10 in the range 10 to 90.
Practice for this standard
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Subtraction
Taking away, counting up, and multi-digit subtraction with borrowing across zeros.
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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.6