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Common Core: 1st Grade Math : Working with Addition and Subtraction Equations

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

Example Question #363 : How To Subtract

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 8-4=12-7\)

\(\displaystyle 8-4=12-8\)

\(\displaystyle 8-4=12-5\)

\(\displaystyle 8-4=12-6\)

Correct answer:

\(\displaystyle 8-4=12-8\)

Explanation:

Both 8-4 \(\displaystyle 8-4\) and 12-8 \(\displaystyle 12-8\) equal \(\displaystyle 4\). So these two equations equal each other. 12-6=6 \(\displaystyle 12-6=6\), 12-7=5 \(\displaystyle 12-7=5\), and 12-5=7 \(\displaystyle 12-5=7\). Because none of these equations equal \(\displaystyle 4\), they can’t be equal to 8-4 \(\displaystyle 8-4\).

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Example Question #361 : How To Subtract

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 10-5=15-10\)

\(\displaystyle 10-5=15-8\)

\(\displaystyle 10-5=15-9\)

\(\displaystyle 10-5=15-7\)

Correct answer:

\(\displaystyle 10-5=15-10\)

Explanation:

Both 10-5 \(\displaystyle 10-5\) and 15-10 \(\displaystyle 15-10\) equal \(\displaystyle 5\). So these two equations equal each other. 15-9=6 \(\displaystyle 15-9=6\), 15-8=7 \(\displaystyle 15-8=7\), and 15-7=8 \(\displaystyle 15-7=8\). Because none of these equations equal \(\displaystyle 5\), they can’t be equal to 10-5 \(\displaystyle 10-5\).

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Example Question #11 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Which of the equations is TRUE?

Possible Answers:

4-2=8-5 \(\displaystyle 4-2=8-5\)

4-2=8-3 \(\displaystyle 4-2=8-3\)

4-2=8-4 \(\displaystyle 4-2=8-4\)

4-2=8-6 \(\displaystyle 4-2=8-6\)

Correct answer:

4-2=8-6 \(\displaystyle 4-2=8-6\)

Explanation:

Both 4-2 \(\displaystyle 4-2\) and 8-6 \(\displaystyle 8-6\) equal \(\displaystyle 2\). So these two equations equal each other. 8-5=3 \(\displaystyle 8-5=3\), 8-4=4 \(\displaystyle 8-4=4\) and 8-3=5 \(\displaystyle 8-3=5\). Because one of those equations equal \(\displaystyle 2\), they cant’ be equal to 4-2 \(\displaystyle 4-2\).

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Example Question #521 : Common Core Math: Grade 1

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 8-2=12-3\)

\(\displaystyle 8-2=12-6\)

\(\displaystyle 8-2=12-2\)

\(\displaystyle 8-2=12-5\)

Correct answer:

\(\displaystyle 8-2=12-6\)

Explanation:

Both 8-2 \(\displaystyle 8-2\) and 12-6 \(\displaystyle 12-6\) equal \(\displaystyle 6\). So these two equations equal each other. 12-5=7 \(\displaystyle 12-5=7\), 12-3=9 \(\displaystyle 12-3=9\), and 12-2=10 \(\displaystyle 12-2=10\). Because none of these equations equal \(\displaystyle 6\), they can’t equal 8-2 \(\displaystyle 8-2\).

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Example Question #12 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 9-2=10-2\)

\(\displaystyle 9-2=10-4\)

\(\displaystyle 9-2=10-3\)

\(\displaystyle 9-2=10-1\)

Correct answer:

\(\displaystyle 9-2=10-3\)

Explanation:

Both 9-2 \(\displaystyle 9-2\) and 10-3 \(\displaystyle 10-3\) equal \(\displaystyle 7\). So these two equations equal each other. 10-2=8 \(\displaystyle 10-2=8\), 10-1=9 \(\displaystyle 10-1=9\), and 10-4=6 \(\displaystyle 10-4=6\). Because none of these equations equal \(\displaystyle 7\), they can’t be equal to 9-2 \(\displaystyle 9-2\).

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Example Question #11 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 12-4=10-5\)

\(\displaystyle 12-4=10-2\)

\(\displaystyle 12-4=10-3\)

\(\displaystyle 12-4=10-4\)

Correct answer:

\(\displaystyle 12-4=10-2\)

Explanation:

Both 12-4 \(\displaystyle 12-4\) and 10-2 \(\displaystyle 10-2\) equal \(\displaystyle 8\). So these two equations equal each other. 10-3=7 \(\displaystyle 10-3=7\), 10-4=6 \(\displaystyle 10-4=6\), and 10-5=5 \(\displaystyle 10-5=5\). Because none of these equations equal \(\displaystyle 8\), they can’t be equal to 12-4 \(\displaystyle 12-4\).

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Example Question #12 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 12-3=10-1\)

\(\displaystyle 12-3=10-4\)

\(\displaystyle 12-3=10-2\)

\(\displaystyle 12-3=10-3\)

Correct answer:

\(\displaystyle 12-3=10-1\)

Explanation:

Both 12-3 \(\displaystyle 12-3\) and 10-1 \(\displaystyle 10-1\) equal \(\displaystyle 9\). So these two equations equal each other. 10-2=8 \(\displaystyle 10-2=8\), 10-3=7 \(\displaystyle 10-3=7\), and 10-6=4 \(\displaystyle 10-6=4\). Because none of these equations equal \(\displaystyle 9\), they can’t be equal to 12-3 \(\displaystyle 12-3\).

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Example Question #18 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 20-10=15-4\)

\(\displaystyle 20-10=15-2\)

\(\displaystyle 20-10=15-5\)

\(\displaystyle 20-10=15-3\)

Correct answer:

\(\displaystyle 20-10=15-5\)

Explanation:

Both 20-10 \(\displaystyle 20-10\) and 15-5 \(\displaystyle 15-5\) equal \(\displaystyle 10\). So these two equations equal each other. 15-4=11 \(\displaystyle 15-4=11\), 15-3=12 \(\displaystyle 15-3=12\), 15-2=13 \(\displaystyle 15-2=13\). Because none of these equations equal \(\displaystyle 10\), they can’t be equal to 20-10 \(\displaystyle 20-10\).

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Example Question #11 : Working With Addition And Subtraction Equations

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 15-4=17-6\)

\(\displaystyle 15-4=14-3\)

\(\displaystyle 15-4=17-5\)

\(\displaystyle 15-4=17-4\)

Correct answer:

\(\displaystyle 15-4=17-6\)

Explanation:

Both 15-4 \(\displaystyle 15-4\) and 17-6 \(\displaystyle 17-6\) equal \(\displaystyle 11\). So these two equations equal each other. 17-5=12 \(\displaystyle 17-5=12\), 17-4=13 \(\displaystyle 17-4=13\), and 17-3=14 \(\displaystyle 17-3=14\). Because none of these equations equal \(\displaystyle 11\), they can’t be equal to 15-4 \(\displaystyle 15-4\).

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Example Question #19 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 14-2=15-2\)

\(\displaystyle 14-2=15-1\)

\(\displaystyle 14-2=15-4\)

\(\displaystyle 14-2=15-3\)

Correct answer:

\(\displaystyle 14-2=15-3\)

Explanation:

Both 14-2 \(\displaystyle 14-2\) and 15-2 \(\displaystyle 15-2\) equal \(\displaystyle 12\). So these two equations equal each other. 15-2=13 \(\displaystyle 15-2=13\), 15-1=14 \(\displaystyle 15-1=14\), and 14-5=11 \(\displaystyle 14-5=11\). Because none of these equations equal \(\displaystyle 12\), they can’t be equal to 12-2 \(\displaystyle 12-2\).

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Common Core: 1st Grade Math : Working with Addition and Subtraction Equations

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #363 : How To Subtract

Example Question #361 : How To Subtract

Example Question #11 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Example Question #521 : Common Core Math: Grade 1

Example Question #12 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Example Question #11 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Example Question #12 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Example Question #18 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Example Question #11 : Working With Addition And Subtraction Equations

Example Question #19 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

All Common Core: 1st Grade Math Resources

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