Adding and Subtracting Within 20 - 1st Grade Math

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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

Jeff needs to collect leaves for a school project. He picked up leaves in his front yard and leaves in his backyard. How many leaves has he collected?

Answer

This is an addition problem because we are putting the leaves that Jeff collected in the front yard together with the leaves he collected in the backyard. When we put things together we are adding.

We can start at and count up .

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

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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

Todd’s street is having a block party. Todd sees families setting up tables and families setting up games. How many total families does Todd see?

Answer

This is an addition problem because we want to know how many total families Todd saw when he puts the families setting up the tables together with the families setting up the games. When we put things together we are adding.

We can start at and count up .

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

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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 .

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

Compare your answer with the correct one above

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