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 #621 : Common Core Math: Grade 1

Fill in the blank. 

\(\displaystyle 15+\)__________\(\displaystyle =18\)

Possible Answers:

\(\displaystyle 2\)

\(\displaystyle 3\)

\(\displaystyle 6\)

\(\displaystyle 5\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 3\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 18-15=3\), which means \(\displaystyle 15+3=18\).

Example Question #41 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 17+\)__________\(\displaystyle =20\) 

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 6\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 3\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 20-17=3\), which means \(\displaystyle 17+3=20\).

Example Question #42 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 5+\)__________\(\displaystyle =6\) 

Possible Answers:

\(\displaystyle 3\)

\(\displaystyle 4\)

\(\displaystyle 2\)

\(\displaystyle 1\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 6-5=1\), which means \(\displaystyle 5+1=6\).

Example Question #43 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 5+\)__________\(\displaystyle =17\) 

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 10\)

\(\displaystyle 13\)

\(\displaystyle 12\)

\(\displaystyle 14\)

Correct answer:

\(\displaystyle 12\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 17-5=12\), which means \(\displaystyle 5+12=17\).

Example Question #44 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 3+\)__________\(\displaystyle =14\) 

Possible Answers:

\(\displaystyle 9\)

\(\displaystyle 10\)

\(\displaystyle 12\)

\(\displaystyle 11\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 11\)

Explanation:

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

Example Question #41 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 3+\)__________\(\displaystyle =18\) 

Possible Answers:

\(\displaystyle 14\)

\(\displaystyle 16\)

\(\displaystyle 15\)

\(\displaystyle 13\)

\(\displaystyle 12\)

Correct answer:

\(\displaystyle 15\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 18-3=15\), which means \(\displaystyle 3+15=18\).

Example Question #46 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank: 

\(\displaystyle 2+\)__________\(\displaystyle =17\) 

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 16\)

\(\displaystyle 14\)

\(\displaystyle 13\)

\(\displaystyle 17\)

Correct answer:

\(\displaystyle 15\)

Explanation:

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. \(\displaystyle 17-2=15\), which means \(\displaystyle 2+15=17\).

Example Question #47 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 2+\)__________\(\displaystyle =19\) 

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 17\)

\(\displaystyle 14\)

\(\displaystyle 18\)

\(\displaystyle 16\)

Correct answer:

\(\displaystyle 17\)

Explanation:

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

Example Question #48 : Find The Missing Number In Addition And Subtraction Equations: Ccss.Math.Content.1.Oa.D.8

Fill in the blank. 

\(\displaystyle 5+\)__________\(\displaystyle =16\) 

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 11\)

\(\displaystyle 9\)

\(\displaystyle 12\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 11\)

Explanation:

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

Example Question #622 : Common Core Math: Grade 1

Fill in the blank. 

\(\displaystyle 3+\)__________\(\displaystyle =17\)

 

 

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 10\)

\(\displaystyle 13\)

\(\displaystyle 14\)

\(\displaystyle 12\)

Correct answer:

\(\displaystyle 14\)

Explanation:

This question is asking what can we add to \(\displaystyle 3\) to get to \(\displaystyle 17\)

We can count up from \(\displaystyle 3\) until we get to \(\displaystyle 17\), and count the number of numbers we had to add after \(\displaystyle 3\)

\(\displaystyle 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17\)

We have to add \(\displaystyle 14\) numbers to get from \(\displaystyle 3\) to \(\displaystyle 17\)

Or we can subtract to find the missing number. 

\(\displaystyle \frac{\begin{array}[b]{r}17\\ -\ \ 3\end{array}}{ \ \ \ \space 14}\)

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