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 #261 : Working With Addition And Subtraction Equations

Fill in the blank. 

\(\displaystyle 8+\)__________\(\displaystyle =18\) 

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 9\)

\(\displaystyle 13\)

\(\displaystyle 10\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 10\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 18-8=10\), which means \(\displaystyle 8+10=18\).

Example Question #191 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 9+\)__________\(\displaystyle =18\) 

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 8\)

\(\displaystyle 6\)

\(\displaystyle 7\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 9\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 18-9=9\), which means \(\displaystyle 9+9=18\).

Example Question #191 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 2+\)__________\(\displaystyle =16\) 

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 12\)

\(\displaystyle 14\)

\(\displaystyle 15\)

\(\displaystyle 13\)

Correct answer:

\(\displaystyle 14\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 16-2=14\), which means \(\displaystyle 2+14=16\).

Example Question #191 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 9+\)__________\(\displaystyle =20\)

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 13\)

\(\displaystyle 12\)

\(\displaystyle 11\)

\(\displaystyle 14\)

Correct answer:

\(\displaystyle 11\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 20-9=11\), which means \(\displaystyle 9+11=20\).

Example Question #772 : Operations & Algebraic Thinking

Fill in the blank. 

\(\displaystyle 10+\)__________\(\displaystyle =11\) 

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 3\)

\(\displaystyle 2\)

\(\displaystyle 4\)

\(\displaystyle 1\)

Correct answer:

\(\displaystyle 1\)

Explanation:

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

Example Question #192 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 11+\)__________\(\displaystyle =14\)

Possible Answers:

\(\displaystyle 7\)

\(\displaystyle 5\)

\(\displaystyle 3\)

\(\displaystyle 4\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 3\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 14-11=3\), which means \(\displaystyle 11+3=14\).

Example Question #191 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 12+\)__________\(\displaystyle =14\) 

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 2\)

\(\displaystyle 5\)

\(\displaystyle 3\)

\(\displaystyle 1\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 14-12=2\), which means \(\displaystyle 12+2=14\).

Example Question #193 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 13+\)__________\(\displaystyle =19\) 

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 4\)

\(\displaystyle 6\)

\(\displaystyle 7\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 6\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 19-13=6\), which means \(\displaystyle 13+6=19\).

Example Question #191 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 14+\)__________\(\displaystyle =17\) 

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 3\)

\(\displaystyle 5\)

\(\displaystyle 4\)

\(\displaystyle 7\)

Correct answer:

\(\displaystyle 3\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 17-14=3\), which means \(\displaystyle 14+3=17\).

Example Question #271 : Working With Addition And Subtraction Equations

Fill in the blank. 

\(\displaystyle 16+\)__________\(\displaystyle =20\) 

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 7\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 4\)

Explanation:

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

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