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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

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

Example Questions

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

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

Possible Answers:

$\displaystyle 50$

100 $\displaystyle 100$

$\displaystyle 60$

$\displaystyle 80$

$\displaystyle 70$

Correct answer:

$\displaystyle 80$

Explanation:

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

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 $\displaystyle 0-0=0$

9-1=8 $\displaystyle 9-1=8$

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

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

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

Possible Answers:

$\displaystyle 80$

$\displaystyle 60$

$\displaystyle 90$

$\displaystyle 50$

$\displaystyle 70$

Correct answer:

$\displaystyle 50$

Explanation:

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

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 $\displaystyle 0-0=0$

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

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

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Example Question #2 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

Solve the following:

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

Possible Answers:

$\displaystyle 20$

$\displaystyle 50$

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 10$

Correct answer:

$\displaystyle 50$

Explanation:

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

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 $\displaystyle 0-0=0$

7-2=5 $\displaystyle 7-2=5$

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

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Example Question #841 : How To Subtract

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

Possible Answers:

$\displaystyle 30$

$\displaystyle 10$

$\displaystyle 0$

$\displaystyle 20$

$\displaystyle 40$

Correct answer:

$\displaystyle 0$

Explanation:

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

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 $\displaystyle 0-0=0$

6-6=0 $\displaystyle 6-6=0$

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

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Example Question #321 : Number & Operations In Base Ten

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

Possible Answers:

$\displaystyle 0$

$\displaystyle 20$

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 40$

Correct answer:

$\displaystyle 10$

Explanation:

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

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 $\displaystyle 0-0=0$

5-4=1 $\displaystyle 5-4=1$

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

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Example Question #971 : Numbers And Operations

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

Possible Answers:

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 10$

$\displaystyle 0$

$\displaystyle 20$

Correct answer:

$\displaystyle 30$

Explanation:

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

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 $\displaystyle 0-0=0$

4-1=3 $\displaystyle 4-1=3$

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

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

$\frac{\begin{array}[b]{r}30\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}30\\ -\ 20\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 10$

$\displaystyle 50$

$\displaystyle 40$

$\displaystyle 30$

$\displaystyle 20$

Correct answer:

$\displaystyle 10$

Explanation:

$\frac{\begin{array}[b]{r}30\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}30\\ -\ 20\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

3-2=1 $\displaystyle 3-2=1$

$\frac{\begin{array}[b]{r}30\\ -\ 20\end{array}}{ \ \ \ \space10}$ $\displaystyle \frac{\begin{array}[b]{r}30\\ -\ 20\end{array}}{ \ \ \ \space10}$

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

$\frac{\begin{array}[b]{r}30\\ -\ 10\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}30\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 50$

$\displaystyle 20$

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 40$

Correct answer:

$\displaystyle 20$

Explanation:

$\frac{\begin{array}[b]{r}30\\ -\ 10\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}30\\ -\ 10\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

3-1=2 $\displaystyle 3-1=2$

$\frac{\begin{array}[b]{r}30\\ -\ 10\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}30\\ -\ 10\end{array}}{ \ \ \ \space20}$

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

$\frac{\begin{array}[b]{r}90\\ -\ 50\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 50\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 50$

$\displaystyle 40$

$\displaystyle 20$

$\displaystyle 60$

$\displaystyle 30$

Correct answer:

$\displaystyle 40$

Explanation:

$\frac{\begin{array}[b]{r}90\\ -\ 50\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 50\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

9-5=4 $\displaystyle 9-5=4$

$\frac{\begin{array}[b]{r}90\\ -\ 50\end{array}}{ \ \ \ \space40}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 50\end{array}}{ \ \ \ \space40}$

Report an Error

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

$\frac{\begin{array}[b]{r}80\\ -\ 60\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 60\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 50$

$\displaystyle 20$

$\displaystyle 30$

$\displaystyle 60$

$\displaystyle 40$

Correct answer:

$\displaystyle 20$

Explanation:

$\frac{\begin{array}[b]{r}80\\ -\ 60\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 60\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

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

$\frac{\begin{array}[b]{r}80\\ -\ 60\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}80\\ -\ 60\end{array}}{ \ \ \ \space20}$

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

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

Example Question #2 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

Example Question #841 : How To Subtract

Example Question #321 : Number & Operations In Base Ten

Example Question #971 : Numbers And Operations

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

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

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

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

All Common Core: 1st Grade Math Resources

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