Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

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MAP 2nd Grade Math › Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

Questions 1 - 10

1

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

Explanation

To subtract we can count backwards. Start at and count back .

$\frac{\begin{array}[b]{r}20\ -\ 20\end{array}}{ \ \ \ \ \space 0}$

2

$\frac{\begin{array}[b]{r}7\ -\ 6\end{array}}{ \ \ \ \ \space ?}$

Explanation

To subtract we can count backwards. Start at and count back .

$\frac{\begin{array}[b]{r}7\ -\ 6\end{array}}{ \ \ \ \space 1}$

3

$\frac{\begin{array}[b]{r}3\ +\ 16\end{array}}{ \ \ \space?}$

Explanation

To add we count up. Start at and count up .

$\frac{\begin{array}[b]{r}3\ +\ 16\end{array}}{ \ \ \space19}$

4

$\frac{\begin{array}[b]{r}19\ -\ 8\end{array}}{ \ \ \ \space ?}$

Explanation

To subtract we can count backwards. Start at and count back .

$\frac{\begin{array}[b]{r}19\ -\ 8\end{array}}{ \ \ \space 11}$

5

$\frac{\begin{array}[b]{r}9\ -\ 6\end{array}}{ \ \ \ \space ?}$

Explanation

To subtract we can count backwards. Start at and count back .

$\frac{\begin{array}[b]{r}9\ -\ 6\end{array}}{ \ \ \ \space 3}$

6

$\frac{\begin{array}[b]{r}1\ +\ 19\end{array}}{ \ \ \space?}$

Explanation

To add we count up. Start at and count up .

$\frac{\begin{array}[b]{r}1\ +\ 19\end{array}}{ \ \ \space20}$

7

$\frac{\begin{array}[b]{r}19\ -\ 13\end{array}}{ \ \ \ \ \space ?}$

Explanation

To subtract we can count backwards. Start at and count back .

$\frac{\begin{array}[b]{r}19\ -\ 13\end{array}}{ \ \ \ \ \space 6}$

8

$\frac{\begin{array}[b]{r}6\ -\ 6\end{array}}{ \ \ \ \space ?}$

Explanation

To subtract we can count backwards. Start at and count back .

$\frac{\begin{array}[b]{r}6\ -\ 6\end{array}}{ \ \ \ \space 0}$

9

$\frac{\begin{array}[b]{r}19\ -\ 2\end{array}}{ \ \ \ \space?}$

Explanation

To subtract we can count backwards. Start at and count back

$\frac{\begin{array}[b]{r}19\ -\ 2\end{array}}{ \ \ \space17}$

10

$\frac{\begin{array}[b]{r}4\ +\ 14\end{array}}{ \ \ \space?}$

Explanation

To add we count up. Start at and count up .

$\frac{\begin{array}[b]{r}4\ +\ 14\end{array}}{ \ \ \ \space18}$

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