Common Core: 1st Grade Math : Understand the Equal Sign, Determine if Equations are True or False: CCSS.MATH.CONTENT.1.OA.D.7

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

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Example Questions

Example Question #1386 : Numbers And Operations

Which of the equations is TRUE?

 

Possible Answers:

\displaystyle 12=8+4

\displaystyle 12=9-4

\displaystyle 12=9+4

\displaystyle 12=8-4

Correct answer:

\displaystyle 12=8+4

Explanation:

When you add \displaystyle 8 and \displaystyle 4 together you get \displaystyle 12. \displaystyle 9+4 does not equal \displaystyle 12 because \displaystyle 9+4=13. \displaystyle 8-4 does not equal \displaystyle 12 because \displaystyle 8-4=4. \displaystyle 9-4 does not equal \displaystyle 12 because \displaystyle 9-4=5

Example Question #325 : How To Add

Which of the equations is TRUE?

 

Possible Answers:

\displaystyle 15=10+5

\displaystyle 15=11+5

\displaystyle 15=11-5

\displaystyle 15=10-5

Correct answer:

\displaystyle 15=10+5

Explanation:

When you add \displaystyle 10 and \displaystyle 5 together you get \displaystyle 15. \displaystyle 11+5 does not equal \displaystyle 15 because \displaystyle 11+5=16. \displaystyle 10-5 does not equal \displaystyle 15 because \displaystyle 10-5=5.\displaystyle 11-5 does not equal \displaystyle 15 because \displaystyle 11-5=6

Example Question #561 : Operations & Algebraic Thinking

Which of the equations is TRUE?

 

Possible Answers:

\displaystyle 4=2-1

\displaystyle 4=2+1

\displaystyle 4=2-2

\displaystyle 4=2+2

Correct answer:

\displaystyle 4=2+2

Explanation:

When you add \displaystyle 2 and \displaystyle 2 together you get \displaystyle 4. \displaystyle 2+1 does not equal \displaystyle 4 because \displaystyle 2+1=3. \displaystyle 2-2 does not equal \displaystyle 4 because \displaystyle 2-2=0. \displaystyle 2-1 does not equal \displaystyle 4 because \displaystyle 2-1=1

Example Question #562 : Operations & Algebraic Thinking

Which of the equations is TRUE?

 

Possible Answers:

\displaystyle 14=7+7

\displaystyle 14=8-7

\displaystyle 14=7-7

\displaystyle 14=7+8

Correct answer:

\displaystyle 14=7+7

Explanation:

When you add \displaystyle 7 and \displaystyle 7 together you get \displaystyle 14. \displaystyle 7+8 does not equal \displaystyle 14 because \displaystyle 7+8=15. \displaystyle 7-7 does not equal \displaystyle 14 because \displaystyle 7-7=0. \displaystyle 8-7 does not equal \displaystyle 14 because\displaystyle 8-7=1

Example Question #331 : How To Add

Which of the equations is TRUE?

 

 

Possible Answers:

\displaystyle 13=9+4

\displaystyle 13=9-4

\displaystyle 13=9-5

\displaystyle 13=9+5

Correct answer:

\displaystyle 13=9+4

Explanation:

When you add \displaystyle 9 and \displaystyle 4 together you get \displaystyle 13. \displaystyle 9+5 does not equal \displaystyle 13 because \displaystyle 9+5=14. \displaystyle 9-4 does not equal \displaystyle 13 because \displaystyle 9-4=5. \displaystyle 9-5 does not equal \displaystyle 13 because \displaystyle 9-5=4

Example Question #564 : Operations & Algebraic Thinking

Which of the equations is TRUE?

 

Possible Answers:

\displaystyle 18=9-8

\displaystyle 18=9+9

\displaystyle 18=9+8

\displaystyle 18=9-9

Correct answer:

\displaystyle 18=9+9

Explanation:

When you add \displaystyle 9 and \displaystyle 9 together you get \displaystyle 18. \displaystyle 9+8 does not equal \displaystyle 18 because \displaystyle 9+8=17. \displaystyle 9-9 does not equal \displaystyle 18 because \displaystyle 9-9=0. \displaystyle 9-8 does not equal \displaystyle 18 because \displaystyle 9-8=1

Example Question #51 : 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 17=9-8

\displaystyle 17=9+9

\displaystyle 17=9+8

\displaystyle 17=9-9

Correct answer:

\displaystyle 17=9+8

Explanation:

When you add \displaystyle 9 and \displaystyle 8 together you get \displaystyle 17. \displaystyle 9+9 does not equal \displaystyle 17 because \displaystyle 9+9=18. \displaystyle 9-8 does not equal \displaystyle 17 because \displaystyle 9-8=1. \displaystyle 9-9 does not equal \displaystyle 17 because \displaystyle 9-9=0

Example Question #333 : How To Add

Which of the equations is TRUE?

 

Possible Answers:

\displaystyle 16=10-5

\displaystyle 16=11-5

\displaystyle 16=10+5

\displaystyle 16=5+11

Correct answer:

\displaystyle 16=5+11

Explanation:

When you add \displaystyle 5 and \displaystyle 11 together you get \displaystyle 16. \displaystyle 10+5 does not equal \displaystyle 16 because \displaystyle 10+5=15. \displaystyle 11-5 does not equal \displaystyle 16 because \displaystyle 11-5=6. \displaystyle 10-5 does not equal \displaystyle 16 because \displaystyle 10-5=5

Example Question #1401 : Numbers And Operations

Which of the equations is TRUE?

 

Possible Answers:

\displaystyle 2+2=8-2

\displaystyle 2+2=8-3

\displaystyle 2+2=8-1

\displaystyle 2+2=8-4

Correct answer:

\displaystyle 2+2=8-4

Explanation:

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

Example Question #51 : Working With Addition And Subtraction Equations

Which of the equations is TRUE?

 

 

Possible Answers:

\displaystyle 2+3=10-5

\displaystyle 2+3=10-4

\displaystyle 2+3-10-3

\displaystyle 2+3=10-2

Correct answer:

\displaystyle 2+3=10-5

Explanation:

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

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