Including adding a two-digit number and a one-digit number.
Number and Operations in Base Ten
Use place value understanding and properties of operations to add and subtract.
Add within 100, using concrete models or drawings and strategies based on place value:
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Explain why addition and subtraction strategies work, using place value and the properties of addition.
Add and subtract within 100 using strategies based on place value, properties of addition, and/or the relationship between addition and subtraction.
Subtract 10 or 100 from a given number 100-900.
Add 10 or 100 to a given number 100-900, and
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 relationship 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.
Relate the strategy to a written method and explain the reasoning used.
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 relationship 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.
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 relationship 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.
