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6. Subtract multiples of 10 in the range 10–90 from multiples of 10 in the range 10–90 (positive or zero differences), using
concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between
addition and subtraction; relate the strategy to a written method and explain the reasoning used.
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2.NBT.6
6. Add up to four two-digit numbers using strategies based on place value and properties of operations.
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4.NBT.6
6. Find whole-number quotients and remainders with up to four-digit dividends and one-digit divisors, using strategies based
on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and
explain the calculation by using equations, rectangular arrays, and/or area models.
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5.NBT.6
6. Find whole-number quotients of whole numbers with up to four-digit dividends and two-digit divisors, using strategies based
on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and
explain the calculation by using equations, rectangular arrays, and/or area models.
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