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Common Core: 1st Grade Math : Place Value and Properties of Operations to Add and Subtract

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

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All Common Core: 1st Grade Math Resources

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Example Questions

Example Question #354 : Number & Operations In Base Ten

$\frac{\begin{array}[b]{r}50\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}50\\ -\ 20\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 50$

$\displaystyle 20$

$\displaystyle 60$

$\displaystyle 40$

$\displaystyle 30$

Correct answer:

$\displaystyle 30$

Explanation:

$\frac{\begin{array}[b]{r}50\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}50\\ -\ 20\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

5-2=3 $\displaystyle 5-2=3$

$\frac{\begin{array}[b]{r}50\\ -\ 20\end{array}}{ \ \ \ \space30}$ $\displaystyle \frac{\begin{array}[b]{r}50\\ -\ 20\end{array}}{ \ \ \ \space30}$

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Example Question #355 : Number & Operations In Base Ten

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

Possible Answers:

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 0$

$\displaystyle 40$

$\displaystyle 20$

Correct answer:

$\displaystyle 0$

Explanation:

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

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 $\displaystyle 0-0=0$

3-3=0 $\displaystyle 3-3=0$

$\frac{\begin{array}[b]{r}30\\ -\ 30\end{array}}{ \ \ \ \ \ \space0}$ $\displaystyle \frac{\begin{array}[b]{r}30\\ -\ 30\end{array}}{ \ \ \ \ \ \space0}$

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Example Question #91 : Place Value And Properties Of Operations To Add And Subtract

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

Possible Answers:

$\displaystyle 20$

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 0$

Correct answer:

$\displaystyle 0$

Explanation:

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

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 $\displaystyle 0-0=0$

2-2=0 $\displaystyle 2-2=0$

$\frac{\begin{array}[b]{r}20\\ -\ 20\end{array}}{ \ \ \ \ \ \space0}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 20\end{array}}{ \ \ \ \ \ \space0}$

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Example Question #801 : How To Subtract

$\frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 50$

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 10$

Correct answer:

$\displaystyle 20$

Explanation:

$\frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

6-4=2 $\displaystyle 6-4=2$

$\frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \ \space20}$

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Example Question #31 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

$\frac{\begin{array}[b]{r}80\\ -\ 50\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 50\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 0$

$\displaystyle 20$

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 40$

Correct answer:

$\displaystyle 30$

Explanation:

$\frac{\begin{array}[b]{r}80\\ -\ 50\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 50\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

8-5=3 $\displaystyle 8-5=3$

$\frac{\begin{array}[b]{r}80\\ -\ 50\end{array}}{ \ \ \ \space30}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 50\end{array}}{ \ \ \ \space30}$

Report an Error

Example Question #92 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 50$

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 10$

Correct answer:

$\displaystyle 20$

Explanation:

$\frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

6-4=2 $\displaystyle 6-4=2$

$\frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 40\end{array}}{ \ \ \ \space20}$

Report an Error

Example Question #361 : Number & Operations In Base Ten

$\frac{\begin{array}[b]{r}90\\ -\ 60\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 60\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 70$

$\displaystyle 60$

$\displaystyle 50$

Correct answer:

$\displaystyle 30$

Explanation:

$\frac{\begin{array}[b]{r}90\\ -\ 60\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 60\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

9-6=3 $\displaystyle 9-6=3$

$\frac{\begin{array}[b]{r}90\\ -\ 60\end{array}}{ \ \ \ \space30}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 60\end{array}}{ \ \ \ \space30}$

Report an Error

Example Question #93 : Place Value And Properties Of Operations To Add And Subtract

$\frac{\begin{array}[b]{r}80\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 20\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 30$

$\displaystyle 60$

$\displaystyle 40$

$\displaystyle 50$

$\displaystyle 20$

Correct answer:

$\displaystyle 60$

Explanation:

$\frac{\begin{array}[b]{r}80\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 20\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

8-2=6 $\displaystyle 8-2=6$

$\frac{\begin{array}[b]{r}80\\ -\ 20\end{array}}{ \ \ \ \space60}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 20\end{array}}{ \ \ \ \space60}$

Report an Error

Example Question #362 : Number & Operations In Base Ten

$\frac{\begin{array}[b]{r}70\\ -\ 30\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}70\\ -\ 30\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 10$

$\displaystyle 50$

Correct answer:

$\displaystyle 40$

Explanation:

$\frac{\begin{array}[b]{r}70\\ -\ 30\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}70\\ -\ 30\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

7-3=4 $\displaystyle 7-3=4$

$\frac{\begin{array}[b]{r}70\\ -\ 30\end{array}}{ \ \ \ \space40}$ $\displaystyle \frac{\begin{array}[b]{r}70\\ -\ 30\end{array}}{ \ \ \ \space40}$

Report an Error

Example Question #361 : Number & Operations In Base Ten

$\frac{\begin{array}[b]{r}60\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 20\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 40$

$\displaystyle 80$

$\displaystyle 50$

$\displaystyle 70$

$\displaystyle 60$

Correct answer:

$\displaystyle 40$

Explanation:

$\frac{\begin{array}[b]{r}60\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 20\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

6-2=4 $\displaystyle 6-2=4$

$\frac{\begin{array}[b]{r}60\\ -\ 20\end{array}}{ \ \ \ \space40}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 20\end{array}}{ \ \ \ \space40}$

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Common Core: 1st Grade Math : Place Value and Properties of Operations to Add and Subtract

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #354 : Number & Operations In Base Ten

Example Question #355 : Number & Operations In Base Ten

Example Question #91 : Place Value And Properties Of Operations To Add And Subtract

Example Question #801 : How To Subtract

Example Question #31 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

Example Question #92 : Place Value And Properties Of Operations To Add And Subtract

Example Question #361 : Number & Operations In Base Ten

Example Question #93 : Place Value And Properties Of Operations To Add And Subtract

Example Question #362 : Number & Operations In Base Ten

Example Question #361 : Number & Operations In Base Ten

All Common Core: 1st Grade Math Resources

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