Tweet # Common Core Standard 1.OA.C.6 Questions

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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Grade 1 Subtraction with Regrouping CCSS: 1.OA.C.6

11 - 5 =
1. 5 + 5 = 10
2. 11 + 2 = 13
3. 6 + 5 = 11

10 - 8 =
1. 8 + 2 = 10
2. 4 + 6 = 10
3. 2 + 5 = 7
Grade 1 Subtraction with Regrouping CCSS: 1.OA.C.6

16 - 8 =
1. 10 + 6 = 16
2. 8 + 8 = 16
3. 4 + 7 = 11

8 + 6 =
1. 14 - 6 = 8
2. 8 - 6 = 2
3. 6 - 3 = 3

9 + 5 =
1. 5 - 4 = 1
2. 14 - 9 = 5
3. 9 - 5 = 4

$6 + 9 = 15$

Which shows another addition sentence that equals 15?
1. $6 + 6 = 15$
2. $9 + 9 = 15$
3. $6 + 6 + 3 = 15$
4. $9 + 9 + 3 = 15$

$8 + 9 = 17$

Which shows another addition sentence that equals 17?
1. $8 + 8 = 17$
2. $8 + 8 + 1 = 17$
3. $9 + 9 = 17$
4. $9 + 9 + 1 = 17$

$4 + 2 + 6 = 12$

Which shows another addition sentence that equals 12?
1. $2 + 10 = 12$
2. $4 + 10 = 12$
3. $6 + 10 = 12$
4. $8 + 10 = 12$

$7 + 4 + 3 = 14$

Which shows another addition sentence that equals 14?
1. $1 + 10 = 14$
2. $2 + 10 = 14$
3. $3 + 10 = 14$
4. $4 + 10 = 14$
What is 2 + 10?
1. 20
2. 12
3. 10
4. 14
12 + 3 =
1. 5
2. 10
3. 15
4. 1  