Add and Subtract 10 to Two-Digit Numbers: CCSS.MATH.CONTENT.1.NBT.C.5 - Common Core: 1st Grade Math

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Question

$\frac{\begin{array}[b]{r}15\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}15\ +\ 10\end{array}}{ \ \ \ \ \space25}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}10\ +\ 10\end{array}}{ \ \ \ \space20}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}20\ +\ 10\end{array}}{ \ \ \ \space30}$

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Question

$\frac{\begin{array}[b]{r}25\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}25\ +\ 10\end{array}}{ \ \ \ \space35}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}20\ +\ 10\end{array}}{ \ \ \ \space40}$

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Question

$\frac{\begin{array}[b]{r}35\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}35\ +\ 10\end{array}}{ \ \ \ \space45}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}40\ +\ 10\end{array}}{ \ \ \ \space50}$

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Question

$\frac{\begin{array}[b]{r}45\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}45\ +\ 10\end{array}}{ \ \ \ \space55}$

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Question

$\frac{\begin{array}[b]{r}50\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}50\ +\ 10\end{array}}{ \ \ \ \space60}$

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Question

$\frac{\begin{array}[b]{r}55\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}55\ +\ 10\end{array}}{ \ \ \ \space65}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}60\ +\ 10\end{array}}{ \ \ \ \space70}$

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Question

$\frac{\begin{array}[b]{r}65\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}65\ +\ 10\end{array}}{ \ \ \ \space75}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}70\ +\ 10\end{array}}{ \ \ \ \space80}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}75\ +\ 10\end{array}}{ \ \ \ \space85}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}80\ +\ 10\end{array}}{ \ \ \ \space90}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}75\ +\ 10\end{array}}{ \ \ \ \space85}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}80\ +\ 10\end{array}}{ \ \ \ \space90}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}85\ +\ 10\end{array}}{ \ \ \ \space95}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}10\ +\ 10\end{array}}{ \ \ \ \space20}$

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Question

$\frac{\begin{array}[b]{r}15\ +\ 10\end{array}}{ \ \ \space}$

Answer

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

$\frac{\begin{array}[b]{r}15\ +\ 10\end{array}}{ \ \ \ \space25}$

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