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Common Core: 1st Grade Math : Number & Operations in Base Ten

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

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All Common Core: 1st Grade Math Resources

7 Diagnostic Tests 180 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #55 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}85\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

When we subtract from a two digit number, the only number that changes in our answer is the tens position, and it will always go down by . Mentally, we can subtract from the number in the tens place to find our answer.

8-1=7

$\frac{\begin{array}[b]{r}85\\ -\ 10\end{array}}{ \ \ \ \space75}$

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Example Question #56 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}80\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

8-1=7

$\frac{\begin{array}[b]{r}80\\ -\ 10\end{array}}{ \ \ \ \space70}$

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Example Question #1032 : Numbers And Operations

$\frac{\begin{array}[b]{r}75\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

7-1=6

$\frac{\begin{array}[b]{r}75\\ -\ 10\end{array}}{ \ \ \ \ \space65}$

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Example Question #57 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}70\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

7-1=6

$\frac{\begin{array}[b]{r}70\\ -\ 10\end{array}}{ \ \ \ \space60}$

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Example Question #61 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}90\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

100

Correct answer:

Explanation:

$\frac{\begin{array}[b]{r}90\\ -\ 10\end{array}}{ \ \ \space}$

When we subtract two digit numbers, we always start with the ones place, on the right, and work our way to the left.

0-0=0

9-1=8

$\frac{\begin{array}[b]{r}90\\ -\ 10\end{array}}{ \ \ \ \space80}$

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Example Question #62 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}80\\ -\ 30\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

$\frac{\begin{array}[b]{r}80\\ -\ 30\end{array}}{ \ \ \space}$

When we subtract two digit numbers, we always start with the ones place, on the right, and work our way to the left.

0-0=0

8-3=5

$\frac{\begin{array}[b]{r}80\\ -\ 30\end{array}}{ \ \ \ \space50}$

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Example Question #63 : Place Value And Properties Of Operations To Add And Subtract

Solve the following:

$\frac{\begin{array}[b]{r}70\\ -\ 20\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

$\frac{\begin{array}[b]{r}70\\ -\ 20\end{array}}{ \ \ \space}$

When we subtract two digit numbers, we always start with the ones place, on the right, and work our way to the left.

0-0=0

7-2=5

$\frac{\begin{array}[b]{r}70\\ -\ 20\end{array}}{ \ \ \ \space50}$

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Example Question #64 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}60\\ -\ 60\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

$\frac{\begin{array}[b]{r}60\\ -\ 60\end{array}}{ \ \ \space}$

When we subtract two digit numbers, we always start with the ones place, on the right, and work our way to the left.

0-0=0

6-6=0

$\frac{\begin{array}[b]{r}60\\ -\ 60\end{array}}{ \ \ \ \ \ \space0}$

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Example Question #65 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}50\\ -\ 40\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

$\frac{\begin{array}[b]{r}50\\ -\ 40\end{array}}{ \ \ \space}$

When we subtract two digit numbers, we always start with the ones place, on the right, and work our way to the left.

0-0=0

5-4=1

$\frac{\begin{array}[b]{r}50\\ -\ 40\end{array}}{ \ \ \ \space10}$

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Example Question #66 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}40\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

$\frac{\begin{array}[b]{r}40\\ -\ 10\end{array}}{ \ \ \space}$

When we subtract two digit numbers, we always start with the ones place, on the right, and work our way to the left.

0-0=0

4-1=3

$\frac{\begin{array}[b]{r}40\\ -\ 10\end{array}}{ \ \ \ \space30}$

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Common Core: 1st Grade Math : Number & Operations in Base Ten

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #55 : Place Value And Properties Of Operations To Add And Subtract

Example Question #56 : Place Value And Properties Of Operations To Add And Subtract

Example Question #1032 : Numbers And Operations

Example Question #57 : Place Value And Properties Of Operations To Add And Subtract

Example Question #61 : Place Value And Properties Of Operations To Add And Subtract

Example Question #62 : Place Value And Properties Of Operations To Add And Subtract

Example Question #63 : Place Value And Properties Of Operations To Add And Subtract

Example Question #64 : Place Value And Properties Of Operations To Add And Subtract

Example Question #65 : Place Value And Properties Of Operations To Add And Subtract

Example Question #66 : Place Value And Properties Of Operations To Add And Subtract

All Common Core: 1st Grade Math Resources

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