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Common Core: 1st Grade Math : Adding and Subtracting Within 20

Study concepts, example questions & explanations for Common Core: 1st Grade Math

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All Common Core: 1st Grade Math Resources

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Example Questions

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Example Question #21 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Fill in the blank: , , , __________,

Possible Answers:

Correct answer:

Explanation:

In this series we are subtracting , or counting down by . 20-4=16 , 16-4=12 , 12-4=8 , and 8-4=4 .

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Example Question #22 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Fill in the blank: , , __________,

Possible Answers:

Correct answer:

Explanation:

In this series we are subtracting , or counting down by . 20-5=15 , 15-5=10 , and 10-5=5 .

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Example Question #23 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Fill in the blank: , __________, ,

Possible Answers:

Correct answer:

Explanation:

In this series we are subtracting , or counting down by . 20-5=15 , 15-5=10 , and 10-5=5 .

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Example Question #24 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Fill in the blank: , , __________, ,

Possible Answers:

Correct answer:

Explanation:

In this series we are subtracting , or counting down by . 15-3=12 , 12-3=9 , 9-3=6 , and 6-3=3 .

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Example Question #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}19\\ -\ 3\end{array}}{ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

19,18,17,16

$\frac{\begin{array}[b]{r}19\\ -\ 3\end{array}}{ \ \ \space 16}$

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Example Question #2 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}18\\ -\ 2\end{array}}{ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

18, 17, 16

$\frac{\begin{array}[b]{r}18\\ -\ 2\end{array}}{ \ \ \space 16}$

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Example Question #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}17\\ -\ 5\end{array}}{ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

17, 16, 15, 14, 13, 12

$\frac{\begin{array}[b]{r}17\\ -\ 5\end{array}}{ \ \ \space 12}$

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Example Question #4 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}16\\ -\ 8\end{array}}{ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

16, 15, 14, 13, 12, 11, 10, 9, 8

$\frac{\begin{array}[b]{r}16\\ -\ 8\end{array}}{ \ \ \ \space 8}$

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Example Question #5 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}16\\ -\ 10\end{array}}{ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6

$\frac{\begin{array}[b]{r}16\\ -\ 10\end{array}}{ \ \ \ \ \ \space 6}$

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Example Question #6 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}15\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

15, 14, 13, 12, 11

$\frac{\begin{array}[b]{r}15\\ -\ 4\end{array}}{ \ \ \ \space 11}$

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All Common Core: 1st Grade Math Resources

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Common Core: 1st Grade Math : Adding and Subtracting Within 20

Study concepts, example questions & explanations for Common Core: 1st Grade Math

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #21 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Example Question #22 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Example Question #23 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Example Question #24 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Example Question #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #2 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #4 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #5 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #6 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

All Common Core: 1st Grade Math Resources

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