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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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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 #771 : How To Subtract

$\frac{\begin{array}[b]{r}40\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}40\\ -\ 20\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 20$

$\displaystyle 50$

$\displaystyle 10$

Correct answer:

$\displaystyle 20$

Explanation:

$\frac{\begin{array}[b]{r}40\\ -\ 20\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}40\\ -\ 20\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

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

$\frac{\begin{array}[b]{r}40\\ -\ 20\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}40\\ -\ 20\end{array}}{ \ \ \ \space20}$

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Example Question #14 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

$\frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 30$

$\displaystyle 0$

$\displaystyle 10$

$\displaystyle 40$

Correct answer:

$\displaystyle 10$

Explanation:

$\frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

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

$\frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \ \space10}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \ \space10}$

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Example Question #772 : How To Subtract

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

Possible Answers:

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 20$

$\displaystyle 40$

$\displaystyle 50$

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 $\displaystyle 8-5=3$

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

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Example Question #771 : Operations

$\frac{\begin{array}[b]{r}90\\ -\ 30\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 30\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 50$

$\displaystyle 60$

$\displaystyle 20$

Correct answer:

$\displaystyle 60$

Explanation:

$\frac{\begin{array}[b]{r}90\\ -\ 30\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 30\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

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

$\frac{\begin{array}[b]{r}90\\ -\ 30\end{array}}{ \ \ \ \space60}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 30\end{array}}{ \ \ \ \space60}$

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Example Question #21 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

$\frac{\begin{array}[b]{r}70\\ -\ 50\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}70\\ -\ 50\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 50$

$\displaystyle 60$

$\displaystyle 20$

$\displaystyle 30$

$\displaystyle 40$

Correct answer:

$\displaystyle 20$

Explanation:

$\frac{\begin{array}[b]{r}70\\ -\ 50\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}70\\ -\ 50\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

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

$\frac{\begin{array}[b]{r}70\\ -\ 50\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}70\\ -\ 50\end{array}}{ \ \ \ \space20}$

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Example Question #772 : Operations

$\frac{\begin{array}[b]{r}60\\ -\ 10\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 50$

$\displaystyle 40$

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 20$

Correct answer:

$\displaystyle 50$

Explanation:

$\frac{\begin{array}[b]{r}60\\ -\ 10\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 10\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

6-1= $\displaystyle 6-1=$$\displaystyle 5$

$\frac{\begin{array}[b]{r}60\\ -\ 10\end{array}}{ \ \ \ \space50}$ $\displaystyle \frac{\begin{array}[b]{r}60\\ -\ 10\end{array}}{ \ \ \ \space50}$

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Example Question #773 : How To Subtract

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

Possible Answers:

$\displaystyle 30$

$\displaystyle 20$

$\displaystyle 40$

$\displaystyle 10$

$\displaystyle 0$

Correct answer:

$\displaystyle 0$

Explanation:

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

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 $\displaystyle 0-0=0$

1-1= $\displaystyle 1-1=$ $\displaystyle 0$

$\frac{\begin{array}[b]{r}10\\ -\ 10\end{array}}{ \ \ \ \ \ \space0}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ -\ 10\end{array}}{ \ \ \ \ \ \space0}$

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Example Question #1011 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}90\\ -\ 70\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 70\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 40$

$\displaystyle 60$

$\displaystyle 20$

$\displaystyle 50$

$\displaystyle 30$

Correct answer:

$\displaystyle 20$

Explanation:

$\frac{\begin{array}[b]{r}90\\ -\ 70\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 70\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

9-7=2 $\displaystyle 9-7=2$

$\frac{\begin{array}[b]{r}90\\ -\ 70\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 70\end{array}}{ \ \ \ \space20}$

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Example Question #24 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

$\frac{\begin{array}[b]{r}90\\ -\ 80\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 80\end{array}}{ \ \ \space}$

Possible Answers:

$\displaystyle 30$

$\displaystyle 40$

$\displaystyle 50$

$\displaystyle 10$

$\displaystyle 20$

Correct answer:

$\displaystyle 10$

Explanation:

$\frac{\begin{array}[b]{r}90\\ -\ 80\end{array}}{ \ \ \space}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 80\end{array}}{ \ \ \space}$

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 $\displaystyle 0-0=0$

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

$\frac{\begin{array}[b]{r}90\\ -\ 80\end{array}}{ \ \ \ \space10}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 80\end{array}}{ \ \ \ \space10}$

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Example Question #21 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

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

Possible Answers:

$\displaystyle 10$

$\displaystyle 30$

$\displaystyle 0$

$\displaystyle 20$

$\displaystyle 40$

Correct answer:

$\displaystyle 0$

Explanation:

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

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 $\displaystyle 0-0=0$

9-9=0 $\displaystyle 9-9=0$

$\frac{\begin{array}[b]{r}90\\ -\ 90\end{array}}{ \ \ \ \ \ \space0}$ $\displaystyle \frac{\begin{array}[b]{r}90\\ -\ 90\end{array}}{ \ \ \ \ \ \space0}$

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Common Core: 1st Grade Math : Common Core Math: Grade 1

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #771 : How To Subtract

Example Question #14 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

Example Question #772 : How To Subtract

Example Question #771 : Operations

Example Question #21 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

Example Question #772 : Operations

Example Question #773 : How To Subtract

Example Question #1011 : Ssat Elementary Level Quantitative (Math)

Example Question #24 : Subtract Multiples Of 10 From Multiples Of 10: Ccss.Math.Content.1.Nbt.C.6

Example Question #21 : 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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