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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 #53 : 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 #51 : 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 #811 : How To Subtract

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

Possible Answers:

Correct answer:

Explanation:

7-1=6

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

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Example Question #1031 : Numbers And Operations

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

Possible Answers:

Correct answer:

Explanation:

7-1=6

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

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

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

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

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

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

Solve the following:

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

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

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

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 #1131 : Common Core Math: Grade 1

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

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

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

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 #53 : Place Value And Properties Of Operations To Add And Subtract

Example Question #51 : Place Value And Properties Of Operations To Add And Subtract

Example Question #811 : How To Subtract

Example Question #1031 : 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 #2 : 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 #1131 : Common Core Math: Grade 1

Example Question #3 : 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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