Common Core: 1st Grade Math : Common Core Math: Grade 1

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

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Example Questions

Example Question #10 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 17+\)__________\(\displaystyle =19\) 

Possible Answers:

\(\displaystyle 2\)

\(\displaystyle 3\)

\(\displaystyle 4\)

\(\displaystyle 5\)

\(\displaystyle 1\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 19-17=2\), which means \(\displaystyle 17+2=19\).

Example Question #591 : Common Core Math: Grade 1

Fill in the blank. 

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

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 1\)

\(\displaystyle 2\)

\(\displaystyle 0\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 4-2=2\), which means \(\displaystyle 2+2=4\).

Example Question #12 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

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

Possible Answers:

\(\displaystyle 2\)

\(\displaystyle 5\)

\(\displaystyle 3\)

\(\displaystyle 1\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 3\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 6-3=3\), which means \(\displaystyle 3+3=6\).

Example Question #12 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 1+\)__________\(\displaystyle =9\) 

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 8\)

\(\displaystyle 7\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 8\)

Explanation:

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

Example Question #14 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 2+\)__________\(\displaystyle =7\)

Possible Answers:

\(\displaystyle 3\)

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 2\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 5\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 7-2=5\), which means \(\displaystyle 2+5=7\).

Example Question #15 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

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

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 5\)

\(\displaystyle 1\)

\(\displaystyle 3\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 6-4=2\), which means \(\displaystyle 4+2=6\).

Example Question #592 : Common Core Math: Grade 1

Fill in the blank. 

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

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 1\)

\(\displaystyle 5\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 4\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 10-6=4\), which means \(\displaystyle 6+4=10\).

Example Question #17 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank.

\(\displaystyle 7+\)__________\(\displaystyle =16\) 

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 9\)

\(\displaystyle 12\)

\(\displaystyle 11\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 9\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 16-7=9\), which means \(\displaystyle 7+9=16\).

Example Question #18 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 9+\)__________\(\displaystyle =15\) 

Possible Answers:

\(\displaystyle 9\)

\(\displaystyle 8\)

\(\displaystyle 6\)

\(\displaystyle 7\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 6\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 15-9=6\), which means \(\displaystyle 9+6=15\).

Example Question #13 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 10+\)__________\(\displaystyle =20\) 

Possible Answers:

\(\displaystyle 13\)

\(\displaystyle 12\)

\(\displaystyle 11\)

\(\displaystyle 10\)

\(\displaystyle 14\)

Correct answer:

\(\displaystyle 10\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 20-10=10\), which means \(\displaystyle 10+10=20\).

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