Knowing How and When to Subtract - 1st Grade Math

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Question

$\frac{\begin{array}[b]{r}20\ -\ 14\end{array}}{ \ \ \ \ \ \space?}$

Answer

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

$\frac{\begin{array}[b]{r}20\ -\ 14\end{array}}{ \ \ \ \ \ \space6}$

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Question

$\frac{\begin{array}[b]{r}3\ -\ 2\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}3\ -\ 2\end{array}}{ \ \ \ \space 1}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}2\ -\ 2\end{array}}{ \ \ \ \space 0}$

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Question

$\frac{\begin{array}[b]{r}20\ -\ 18\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}20\ -\ 18\end{array}}{ \ \ \ \ \ \space 2}$

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Question

$\frac{\begin{array}[b]{r}4\ -\ 3\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}4\ -\ 3\end{array}}{ \ \ \ \space 1}$

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Question

$\frac{\begin{array}[b]{r}20\ -\ 4\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}20\ -\ 4\end{array}}{ \ \ \space 16}$

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Question

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

Answer

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

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

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Question

$\frac{\begin{array}[b]{r}18\ -\ 3\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}18\ -\ 3\end{array}}{ \ \ \space15}$

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Question

$\frac{\begin{array}[b]{r}17\ -\ 14\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}17\ -\ 14\end{array}}{ \ \ \ \ \ \space 3}$

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Question

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

Answer

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

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

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Question

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

Answer

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

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

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Question

$\frac{\begin{array}[b]{r}14\ -\ 10\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}14\ -\ 10\end{array}}{ \ \ \ \ \ \space 4}$

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Question

$\frac{\begin{array}[b]{r}13\ -\ 2\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}13\ -\ 2\end{array}}{ \ \ \space 11}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}12\ -\ 5\end{array}}{ \ \ \ \space 7}$

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Question

$\frac{\begin{array}[b]{r}11\ -\ 6\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}11\ -\ 6\end{array}}{ \ \ \ \space 5}$

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Question

$\frac{\begin{array}[b]{r}10\ -\ 3\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}10\ -\ 3\end{array}}{ \ \ \ \space 7}$

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Question

$\frac{\begin{array}[b]{r}9\ -\ 7\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}9\ -\ 7\end{array}}{ \ \ \ \space 2}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}9\ -\ 9\end{array}}{ \ \ \ \space 0}$

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Question

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

Answer

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

$\frac{\begin{array}[b]{r}8\ -\ 5\end{array}}{ \ \ \ \space 3}$

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Question

$\frac{\begin{array}[b]{r}7\ -\ 5\end{array}}{ \ \ \ \space ?}$

Answer

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

$\frac{\begin{array}[b]{r}7\ -\ 5\end{array}}{ \ \ \ \space 2}$

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