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

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Example Questions

Example Question #1 : 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:

5+4=6+3 \(\displaystyle 5+4=6+3\)

5+4=6+2 \(\displaystyle 5+4=6+2\)

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

5+4=8+3 \(\displaystyle 5+4=8+3\)

Correct answer:

5+4=6+3 \(\displaystyle 5+4=6+3\)

Explanation:

Both 5+4 \(\displaystyle 5+4\) and 6+3 \(\displaystyle 6+3\) equal \(\displaystyle 9\). So these two equations equal each other. 8+2=10 \(\displaystyle 8+2=10\), 6+2= 8 \(\displaystyle 6+2= 8\), and 8+3=11 \(\displaystyle 8+3=11\). Because none of these equations equal \(\displaystyle 9\), they can’t be equal to 5+4 \(\displaystyle 5+4\).

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Example Question #2 : 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+4=6+2 \(\displaystyle 4+4=6+2\)

4+4=6+3 \(\displaystyle 4+4=6+3\)

4+4=5+5 \(\displaystyle 4+4=5+5\)

4+4=5+2 \(\displaystyle 4+4=5+2\)

Correct answer:

4+4=6+2 \(\displaystyle 4+4=6+2\)

Explanation:

Both 4+4 \(\displaystyle 4+4\) and 6+2 \(\displaystyle 6+2\) equal \(\displaystyle 8\). So these two equations equal each other. 5+5=10 \(\displaystyle 5+5=10\), 6+3=9 \(\displaystyle 6+3=9\), and 5+2=7 \(\displaystyle 5+2=7\). Because none of these equations equal \(\displaystyle 8\), they can’t be equal to 4+4 \(\displaystyle 4+4\).

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Example Question #1 : Working With Addition And Subtraction Equations

Which of the equations is TRUE?

Possible Answers:

3+4=5+3 \(\displaystyle 3+4=5+3\)

3+4=5+1 \(\displaystyle 3+4=5+1\)

3+4=5+2 \(\displaystyle 3+4=5+2\)

3+4=5+4 \(\displaystyle 3+4=5+4\)

Correct answer:

3+4=5+2 \(\displaystyle 3+4=5+2\)

Explanation:

Both 3+4 \(\displaystyle 3+4\) and 5+2 \(\displaystyle 5+2\) equal \(\displaystyle 7\). So these two equations equal each other. 5+3=8 \(\displaystyle 5+3=8\), 5+4=9 \(\displaystyle 5+4=9\), and 5+1=6 \(\displaystyle 5+1=6\). Because none of these equations equal \(\displaystyle 7\), they can’t be equal to 3+4 \(\displaystyle 3+4\).

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Example Question #4 : Working With Addition And Subtraction Equations

Which of the equations is TRUE?

Possible Answers:

5+5=8+3 \(\displaystyle 5+5=8+3\)

5+5=8+2 \(\displaystyle 5+5=8+2\)

5+5=8+5 \(\displaystyle 5+5=8+5\)

5+5=8+4 \(\displaystyle 5+5=8+4\)

Correct answer:

5+5=8+2 \(\displaystyle 5+5=8+2\)

Explanation:

Both 5+5 \(\displaystyle 5+5\) and 8+2 \(\displaystyle 8+2\) equal \(\displaystyle 10\). So these two equations equal each other. 8+3=11 \(\displaystyle 8+3=11\), 8+4=12 \(\displaystyle 8+4=12\), and 8+5=13 \(\displaystyle 8+5=13\). Because none of these equations equal \(\displaystyle 10\), they can’t be equal to 5+5 \(\displaystyle 5+5\).

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Example Question #3 : 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:

8+5=7+9 \(\displaystyle 8+5=7+9\)

8+5=7+6 \(\displaystyle 8+5=7+6\)

8+5=7+8 \(\displaystyle 8+5=7+8\)

8+5=7+7 \(\displaystyle 8+5=7+7\)

Correct answer:

8+5=7+6 \(\displaystyle 8+5=7+6\)

Explanation:

Both 8+5 \(\displaystyle 8+5\) and 7+6 \(\displaystyle 7+6\) equal \(\displaystyle 13\). So these two equations equal each other. 7+7=14 \(\displaystyle 7+7=14\), 7+8=15 \(\displaystyle 7+8=15\), and 7+9=16 \(\displaystyle 7+9=16\). Because none of these equations equal \(\displaystyle 13\), they can’t be equal to 8+5 \(\displaystyle 8+5\).

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Example Question #1 : 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:

7+7=9+7 \(\displaystyle 7+7=9+7\)

7+7=9+5 \(\displaystyle 7+7=9+5\)

7+7-9+8 \(\displaystyle 7+7-9+8\)

7+7=9+6 \(\displaystyle 7+7=9+6\)

Correct answer:

7+7=9+5 \(\displaystyle 7+7=9+5\)

Explanation:

Both 7+7 \(\displaystyle 7+7\) and 9+5 \(\displaystyle 9+5\) equal \(\displaystyle 14\). So these two equations equal each other. 9+6=15 \(\displaystyle 9+6=15\), 9+7=16 \(\displaystyle 9+7=16\), and 9+8=17 \(\displaystyle 9+8=17\). Because none of these equations equal \(\displaystyle 14\), they can’t be equal to 7+7 \(\displaystyle 7+7\).

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Example Question #3 : Working With Addition And Subtraction Equations

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 7+10=5+12\)

\(\displaystyle 7+10-5+13\)

\(\displaystyle 7+10=5+14\)

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

Correct answer:

\(\displaystyle 7+10=5+12\)

Explanation:

Both 7+10 \(\displaystyle 7+10\) and 5+12 \(\displaystyle 5+12\) equal \(\displaystyle 17\). So these two equations equal each other. 5+13=18 \(\displaystyle 5+13=18\), 5+14=19 \(\displaystyle 5+14=19\), and 5+15=20 \(\displaystyle 5+15=20\). Because none of these equations equal \(\displaystyle 17\), they can’t be equal to 7+10 \(\displaystyle 7+10\).

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Example Question #2 : 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:

\(\displaystyle 9+9=10+6\)

\(\displaystyle 9+9=10+8\)

\(\displaystyle 9+9=10+7\)

\(\displaystyle 9+9=10+5\)

Correct answer:

\(\displaystyle 9+9=10+8\)

Explanation:

Both 9+9 \(\displaystyle 9+9\) and 10+8 \(\displaystyle 10+8\) equal \(\displaystyle 18\). So these two equations equal each other. 10+7=17 \(\displaystyle 10+7=17\), 10+6=16 \(\displaystyle 10+6=16\), and 10+5=15 \(\displaystyle 10+5=15\). Because none of these equations equal \(\displaystyle 18\), they can’t be equal to 9+9 \(\displaystyle 9+9\).

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Example Question #8 : Working With Addition And Subtraction Equations

Which of the equations is TRUE?

Possible Answers:

\(\displaystyle 8+8=11+7\)

\(\displaystyle 8+8=11+3\)

\(\displaystyle 8+8=11+5\)

\(\displaystyle 8+8=11+4\)

Correct answer:

\(\displaystyle 8+8=11+5\)

Explanation:

Both 8+8 \(\displaystyle 8+8\) and 11+5 \(\displaystyle 11+5\) equal \(\displaystyle 16\). So these two equations equal each other. 11+4=15 \(\displaystyle 11+4=15\), 11+3=14 \(\displaystyle 11+3=14\), and 11+7=18 \(\displaystyle 11+7=18\). Because none of these equations equal \(\displaystyle 16\), they can’t be equal to 8+8 \(\displaystyle 8+8\).

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Example Question #6 : Working With Addition And Subtraction Equations

Which of the equations is TRUE?

Possible Answers:

6+5=9+1 \(\displaystyle 6+5=9+1\)

6+5=9+2 \(\displaystyle 6+5=9+2\)

6+5=9+4 \(\displaystyle 6+5=9+4\)

6+5=9+3 \(\displaystyle 6+5=9+3\)

Correct answer:

6+5=9+2 \(\displaystyle 6+5=9+2\)

Explanation:

Explanation: Both 6+5 \(\displaystyle 6+5\) and 9+2 \(\displaystyle 9+2\) equal \(\displaystyle 11\). So these two equations equal each other. 9+3=12 \(\displaystyle 9+3=12\), 9+4=13 \(\displaystyle 9+4=13\), and 9+1=10 \(\displaystyle 9+1=10\). Because none of these equations equal \(\displaystyle 11\), they can’t be equal to 6+5 \(\displaystyle 6+5\).

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

Example Question #2 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Example Question #1 : Working With Addition And Subtraction Equations

Example Question #4 : Working With Addition And Subtraction Equations

Example Question #3 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

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

Example Question #3 : Working With Addition And Subtraction Equations

Example Question #2 : Understand The Equal Sign, Determine If Equations Are True Or False: Ccss.Math.Content.1.Oa.D.7

Example Question #8 : Working With Addition And Subtraction Equations

Example Question #6 : Working With Addition And Subtraction Equations

All Common Core: 1st Grade Math Resources

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