Adding and Subtracting Within 20 - Common Core: 1st Grade Math

Card 0 of 20

Question

$\frac{\begin{array}[b]{r}19\ -\ 3\end{array}}{ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}19\ -\ 3\end{array}}{ \ \ \space 16}$

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Question

$\frac{\begin{array}[b]{r}18\ -\ 2\end{array}}{ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}18\ -\ 2\end{array}}{ \ \ \space 16}$

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Question

$\frac{\begin{array}[b]{r}17\ -\ 5\end{array}}{ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}17\ -\ 5\end{array}}{ \ \ \space 12}$

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Question

$\frac{\begin{array}[b]{r}16\ -\ 8\end{array}}{ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}16\ -\ 8\end{array}}{ \ \ \ \space 8}$

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Question

$\frac{\begin{array}[b]{r}16\ -\ 10\end{array}}{ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}16\ -\ 10\end{array}}{ \ \ \ \ \ \space 6}$

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Question

$\frac{\begin{array}[b]{r}15\ -\ 4\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}15\ -\ 4\end{array}}{ \ \ \ \space 11}$

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Question

$\frac{\begin{array}[b]{r}14\ -\ 5\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}14\ -\ 5\end{array}}{ \ \ \ \space 9}$

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Question

$\frac{\begin{array}[b]{r}13\ -\ 5\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}13\ -\ 5\end{array}}{ \ \ \ \space 8}$

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Question

$\frac{\begin{array}[b]{r}12\ -\ 6\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}12\ -\ 6\end{array}}{ \ \ \ \space 6}$

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Question

$\frac{\begin{array}[b]{r}11\ -\ 4\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}11\ -\ 4\end{array}}{ \ \ \ \space 7}$

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Question

$\frac{\begin{array}[b]{r}8\ -\ 1\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}8\ -\ 1\end{array}}{ \ \ \ \space 7}$

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Question

$\frac{\begin{array}[b]{r}19\ -\ 5\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}19\ -\ 5\end{array}}{ \ \ \space 14}$

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Question

$\frac{\begin{array}[b]{r}18\ -\ 7\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}18\ -\ 7\end{array}}{ \ \ \space 11}$

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Question

$\frac{\begin{array}[b]{r}17\ -\ 7\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}17\ -\ 7\end{array}}{ \ \ \space 10}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}16\ -\ 3\end{array}}{ \ \ \ \space 13}$

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Question

$\frac{\begin{array}[b]{r}20\ -\ 7\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}20\ -\ 7\end{array}}{ \ \ \space 13}$

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Question

$\frac{\begin{array}[b]{r}17\ -\ 17\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}17\ -\ 17\end{array}}{ \ \ \ \space 0}$

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Question

$\frac{\begin{array}[b]{r}17\ -\ 9\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}17\ -\ 9\end{array}}{ \ \ \ \space 8}$

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Question

$\frac{\begin{array}[b]{r}16\ -\ 5\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}16\ -\ 5\end{array}}{ \ \ \space11}$

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Question

$\frac{\begin{array}[b]{r}15\ -\ 6\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}15\ -\ 6\end{array}}{ \ \ \ \space 9}$

Compare your answer with the correct one above

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