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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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Example Questions

Example Question #1 : Adding And Subtracting Within 20

Fill in the blank. \(\displaystyle 2\), \(\displaystyle 4\), _________, \(\displaystyle 8\), \(\displaystyle 10\).

Possible Answers:

\(\displaystyle 8\)

\(\displaystyle 5\)

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 7\)

Correct answer:

\(\displaystyle 6\)

Explanation:

In this series we are adding \(\displaystyle 2\) each time, or counting by \(\displaystyle 2\). 2+2=4 \(\displaystyle 2+2=4\), 4+2=6 \(\displaystyle 4+2=6\), 6+2=8 \(\displaystyle 6+2=8\) and 8+2=10 \(\displaystyle 8+2=10\)

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Example Question #1 : Adding And Subtracting Within 20

Fill in the blank \(\displaystyle 4\), \(\displaystyle 8\), __________, \(\displaystyle 16\), \(\displaystyle 20\)

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 14\)

\(\displaystyle 12\)

\(\displaystyle 13\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 12\)

Explanation:

In this series we are adding \(\displaystyle 4\) each time, or counting by \(\displaystyle 4\). 4+4=8 \(\displaystyle 4+4=8\), 8+4=12 \(\displaystyle 8+4=12\), 12+4=16 \(\displaystyle 12+4=16\), and 16+4=20 \(\displaystyle 16+4=20\).

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Example Question #2 : Adding And Subtracting Within 20

Fill in the blank \(\displaystyle 2\), \(\displaystyle 4\), \(\displaystyle 6\), __________, \(\displaystyle 10\)

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 6\)

\(\displaystyle 5\)

\(\displaystyle 8\)

\(\displaystyle 7\)

Correct answer:

\(\displaystyle 8\)

Explanation:

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Example Question #2 : Adding And Subtracting Within 20

Fill in the blank: \(\displaystyle 3\), \(\displaystyle 6\), \(\displaystyle 9\),__________, \(\displaystyle 15\)

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 11\)

\(\displaystyle 14\)

\(\displaystyle 16\)

\(\displaystyle 13\)

Correct answer:

\(\displaystyle 12\)

Explanation:

In this series we are adding \(\displaystyle 3\) each time, or counting by \(\displaystyle 3\). 3+3=6 \(\displaystyle 3+3=6\), 6+3=9 \(\displaystyle 6+3=9\), 9+3=12 \(\displaystyle 9+3=12\), and 12+3=15 \(\displaystyle 12+3=15\).

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Example Question #1 : Adding And Subtracting Within 20

Fill in the blank: \(\displaystyle 4\), \(\displaystyle 8\), \(\displaystyle 12\), __________

Possible Answers:

\(\displaystyle 19\)

\(\displaystyle 20\)

\(\displaystyle 17\)

\(\displaystyle 18\)

\(\displaystyle 16\)

Correct answer:

\(\displaystyle 16\)

Explanation:

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Example Question #3 : Adding And Subtracting Within 20

Fill in the blank: \(\displaystyle 2\), \(\displaystyle 4\), \(\displaystyle 6\), \(\displaystyle 8\), __________, \(\displaystyle 12\)

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 7\)

\(\displaystyle 11\)

\(\displaystyle 9\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 10\)

Explanation:

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Example Question #4 : Adding And Subtracting Within 20

Fill in the blank: \(\displaystyle 3\), \(\displaystyle 6\), \(\displaystyle 9\), \(\displaystyle 12\), __________, \(\displaystyle 18\)

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 14\)

\(\displaystyle 16\)

\(\displaystyle 12\)

\(\displaystyle 13\)

Correct answer:

\(\displaystyle 15\)

Explanation:

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Example Question #2 : Adding And Subtracting Within 20

Fill in the blank: \(\displaystyle 4\), \(\displaystyle 8\), \(\displaystyle 12\),\(\displaystyle 16\), __________

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 22\)

\(\displaystyle 17\)

\(\displaystyle 20\)

\(\displaystyle 19\)

Correct answer:

\(\displaystyle 20\)

Explanation:

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Example Question #8 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Fill in the blank: \(\displaystyle 5\), __________, \(\displaystyle 15\), \(\displaystyle 20\)

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 12\)

\(\displaystyle 9\)

\(\displaystyle 8\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 10\)

Explanation:

In this series we are adding \(\displaystyle 5\) each time, or counting by \(\displaystyle 5\). \(\displaystyle 5+5=10\), 10+5=15 \(\displaystyle 10+5=15\), 15+5=20 \(\displaystyle 15+5=20\).

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Example Question #2 : Adding And Subtracting Within 20

Fill in the blank: \(\displaystyle 5\), \(\displaystyle 10\), __________, \(\displaystyle 20\)

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 13\)

\(\displaystyle 12\)

\(\displaystyle 15\)

\(\displaystyle 17\)

Correct answer:

\(\displaystyle 15\)

Explanation:

In this series we are adding \(\displaystyle 5\) each time, or counting by \(\displaystyle 5\). 5+5=10 \(\displaystyle 5+5=10\), 10+5=15 \(\displaystyle 10+5=15\), 15+5=20 \(\displaystyle 15+5=20\).

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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 #1 : Adding And Subtracting Within 20

Example Question #1 : Adding And Subtracting Within 20

Example Question #2 : Adding And Subtracting Within 20

Example Question #2 : Adding And Subtracting Within 20

Example Question #1 : Adding And Subtracting Within 20

Example Question #3 : Adding And Subtracting Within 20

Example Question #4 : Adding And Subtracting Within 20

Example Question #2 : Adding And Subtracting Within 20

Example Question #8 : Relate Counting To Addition And Subtraction: Ccss.Math.Content.1.Oa.C.5

Example Question #2 : Adding And Subtracting Within 20

All Common Core: 1st Grade Math Resources

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