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 #601 : Operations & Algebraic Thinking

Fill in the blank. 

\(\displaystyle 4+\)__________\(\displaystyle =20\) 

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 16\)

\(\displaystyle 14\)

\(\displaystyle 13\)

\(\displaystyle 12\)

Correct answer:

\(\displaystyle 16\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 20-4=16\), which means \(\displaystyle 4+16=20\).

Example Question #611 : Operations & Algebraic Thinking

Fill in the blank. 

\(\displaystyle 5+\)__________\(\displaystyle =20\) 

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 15\)

\(\displaystyle 14\)

\(\displaystyle 16\)

\(\displaystyle 17\)

Correct answer:

\(\displaystyle 15\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 20-5=15\), which means \(\displaystyle 5+15=20\).

Example Question #612 : Operations & Algebraic Thinking

Fill in the blank. 

\(\displaystyle 6+\)__________\(\displaystyle =13\) 

Possible Answers:

\(\displaystyle 8\)

\(\displaystyle 6\)

\(\displaystyle 7\)

\(\displaystyle 5\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 7\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 13-6=7\), which means \(\displaystyle 6+7=13\).

Example Question #613 : Operations & Algebraic Thinking

Fill in the blank. 

\(\displaystyle 7+\)__________\(\displaystyle =12\) 

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 5\)

\(\displaystyle 6\)

\(\displaystyle 2\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 5\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 12-7=5\), which means \(\displaystyle 7+5=12\).

Example Question #612 : Common Core Math: Grade 1

Fill in the blank. 

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

Possible Answers:

\(\displaystyle 1\)

\(\displaystyle 2\)

\(\displaystyle 4\)

\(\displaystyle 5\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 9-8=1\), which means \(\displaystyle 8+1=9\).

Example Question #106 : Working With Addition And Subtraction Equations

Fill in the blank. 

\(\displaystyle 9+\)__________\(\displaystyle =13\) 

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 7\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 4\)

Explanation:

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

Example Question #107 : Working With Addition And Subtraction Equations

Fill in the blank. 

\(\displaystyle 10+\)__________\(\displaystyle =12\) 

Possible Answers:

\(\displaystyle 0\)

\(\displaystyle 1\)

\(\displaystyle 4\)

\(\displaystyle 2\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 12-10=2\), which means \(\displaystyle 10+2=12\).

Example Question #108 : Working With Addition And Subtraction Equations

Fill in the blank. 

\(\displaystyle 11+\)__________\(\displaystyle =15\) 

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 2\)

\(\displaystyle 6\)

\(\displaystyle 3\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 4\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 15-11=4\), which means \(\displaystyle 11+4=15\).

Example Question #614 : Operations & Algebraic Thinking

Fill in the blank. 

\(\displaystyle 12+\)__________\(\displaystyle =13\) 

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 2\)

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 1\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 13-12=1\), which means \(\displaystyle 12+1=13\).

Example Question #101 : Working With Addition And Subtraction Equations

Fill in the blank. 

\(\displaystyle 13+\)__________\(\displaystyle =17\) 

Possible Answers:

\(\displaystyle 3\)

\(\displaystyle 6\)

\(\displaystyle 2\)

\(\displaystyle 5\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 4\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 17-13=4\), which means \(\displaystyle 13+4=17\).

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