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# Common Core Standard 1.NBT.C.4 Questions

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.

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6 + 23
1. 30
2. 41
3. 23
4. 29
23 + 7
1. 16
2. 30
3. 24
4. 8
8 + 16 =
1. 40
2. 24
3. 21
4. 9
18 + 7
1. 25
2. 26
3. 45
4. 19
23 + 5 =
1. 943
2. 59
3. 28
4. 90
94 + 6 =
1. 100
2. 92
3. 102
4. 90
58 + 40 =
1. 10
2. 98
3. 108
4. 90
33 + 20 =
1. 50
2. 53
3. 60
4. 63
$5+10=$
1. 5
2. 10
3. 15
4. 20
Regroup.

4 tens + 23 ones =
1. 4 tens + 3 ones
2. 5 tens + 3 ones
3. 6 tens + 3 ones
4. 7 tens + 3 ones