2.NBT.7

Add and subtract within 1000, 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. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Add multiples of 100

Add Multiples of 100

3 digit + 1 digit

3 Digit + 1 Digit

3 digit + 2 digit

3 Digit + 2 Digit

3 digit + 3 digit

3 Digit + 3 Digit

Add by composing tens

Add by Composing Tens

Add by composing hundreds

Add by Composing Hundreds

Add by composing tens and hundreds

Add by Composing Tens and Hundreds

Word problems

Word Problems

Subtract multiples of 100

Subtract Multiples of 100

3 digit - 1 digit

3 Digit - 1 Digit

3 digit - 2 digit

3 Digit - 2 Digit

3 digit - 3 digit

3 Digit - 3 Digit

Subtract by breaking up tens

Subtract by Breaking up Tens

Subtract by breaking up hundreds

Subtract by Breaking up Hundreds

Subtract by breaking up tens and hundreds

Subtract by Breaking up Tens and Hundreds

Word problems

Word Problems