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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Example Questions

Example Question #79 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 11+\)__________\(\displaystyle =16\) 

Possible Answers:

\(\displaystyle 7\)

\(\displaystyle 6\)

\(\displaystyle 9\)

\(\displaystyle 5\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 5\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 16-11=5\), which means \(\displaystyle 11+5=16\).

Example Question #1421 : Ssat Elementary Level Quantitative (Math)

Fill in the blank. 

\(\displaystyle 12+\)__________\(\displaystyle =18\) 

Possible Answers:

\(\displaystyle 3\)

\(\displaystyle 4\)

\(\displaystyle 2\)

\(\displaystyle 6\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 6\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 18-12=6\), which means \(\displaystyle 12+6=18\).

Example Question #662 : Common Core Math: Grade 1

Fill in the blank. 

\(\displaystyle 1+\)__________\(\displaystyle =2\) 

Possible Answers:

\(\displaystyle 2\)

\(\displaystyle 4\)

\(\displaystyle 1\)

\(\displaystyle 0\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 2-1=1\), which means \(\displaystyle 1+1=2\).

Example Question #663 : Common Core Math: Grade 1

Fill in the blank.

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

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 2\)

\(\displaystyle 3\)

\(\displaystyle 6\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 6\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 8-2=6\), which means \(\displaystyle 2+6=8\).

Example Question #1423 : Numbers And Operations

Fill in the blank. 

\(\displaystyle 3+\)__________\(\displaystyle =7\) 

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 6\)

\(\displaystyle 2\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 4\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 7-3=4\), which means \(\displaystyle 3+4=7\).

Example Question #151 : Working With Addition And Subtraction Equations

Fill in the blank. 

\(\displaystyle 4+\)__________\(\displaystyle =13\) 

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 6\)

\(\displaystyle 9\)

\(\displaystyle 8\)

\(\displaystyle 7\)

Correct answer:

\(\displaystyle 9\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 13-4=9\), which means \(\displaystyle 4+9=13\).

Example Question #666 : Common Core Math: Grade 1

Fill in the blank. 

\(\displaystyle 13+\)__________\(\displaystyle =14\) 

Possible Answers:

\(\displaystyle 1\)

\(\displaystyle 5\)

\(\displaystyle 3\)

\(\displaystyle 2\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 14-13=1\), which means \(\displaystyle 13+1=14\).

Example Question #667 : Common Core Math: Grade 1

Fill in the blank. 

\(\displaystyle 15+\)__________\(\displaystyle =19\) 

Possible Answers:

\(\displaystyle 7\)

\(\displaystyle 4\)

\(\displaystyle 6\)

\(\displaystyle 5\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 4\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 19-15=4\), which means \(\displaystyle 15+4=19\).

Example Question #668 : Common Core Math: Grade 1

Fill in the blank. 

\(\displaystyle 19+\)__________\(\displaystyle =20\) 

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 0\)

\(\displaystyle 3\)

\(\displaystyle 2\)

\(\displaystyle 1\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 20-19=1\), which means \(\displaystyle 19+1=20\).

Example Question #81 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 1+\)__________\(\displaystyle =11\) 

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 8\)

\(\displaystyle 9\)

\(\displaystyle 7\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 10\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 11-1=10\), which means \(\displaystyle 1+10=11\)

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