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Use place value understanding and properties of operations to add and subtract.
1.NBT.4
4. Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple
of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relation
ship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand
that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
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2.NBT.4
4. Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to
record the results of comparisons.
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4.NBT.4
4. Fluently add and subtract multi-digit whole numbers using the standard algorithm.
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4.NBT.4
4. Use place value understanding to round decimals to any place.
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