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Common Core: 1st Grade Math : Knowing How and When to Subtract

Study concepts, example questions & explanations for Common Core: 1st Grade Math

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All Common Core: 1st Grade Math Resources

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Example Questions

Example Question #891 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 9$

$\displaystyle 8$

$\displaystyle 7$

$\displaystyle 6$

$\displaystyle 10$

Correct answer:

$\displaystyle 6$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 20$ and count back 14. $\displaystyle 14.$

$\displaystyle 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6$

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

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Example Question #761 : Numbers And Operations

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

Possible Answers:

$\displaystyle 1$

$\displaystyle 5$

$\displaystyle 2$

$\displaystyle 3$

$\displaystyle 4$

Correct answer:

$\displaystyle 1$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 3$ and count back $\displaystyle 2$.

3, 2, 1 $\displaystyle 3, 2, 1$

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

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Example Question #891 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 1$

$\displaystyle 4$

$\displaystyle 3$

$\displaystyle 2$

$\displaystyle 0$

Correct answer:

$\displaystyle 0$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 2$ and count back $\displaystyle 2$.

2, 1, 0 $\displaystyle 2, 1, 0$

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

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Example Question #1465 : Common Core Math: Grade 1

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

Possible Answers:

$\displaystyle 0$

$\displaystyle 4$

$\displaystyle 3$

$\displaystyle 1$

$\displaystyle 2$

Correct answer:

$\displaystyle 2$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 20$ and count back $\displaystyle 18$.

$\displaystyle 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2$

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

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Example Question #1466 : Common Core Math: Grade 1

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

Possible Answers:

$\displaystyle 2$

$\displaystyle 4$

$\displaystyle 3$

$\displaystyle 5$

$\displaystyle 1$

Correct answer:

$\displaystyle 1$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 4$ and count back $\displaystyle 3$.

$\displaystyle 4, 3, 2, 1,$

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

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Example Question #1 : Knowing How And When To Subtract

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

Possible Answers:

$\displaystyle 15$

$\displaystyle 13$

$\displaystyle 17$

$\displaystyle 14$

$\displaystyle 16$

Correct answer:

$\displaystyle 16$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 20$ and count back $\displaystyle 4.$

$\displaystyle 20, 19, 18, 17, 16$

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

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Example Question #771 : Numbers And Operations

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

Possible Answers:

$\displaystyle 13$

$\displaystyle 14$

$\displaystyle 16$

$\displaystyle 17$

$\displaystyle 15$

Correct answer:

$\displaystyle 13$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 19$ and count back $\displaystyle 6$.

$\displaystyle 19, 18, 17, 16, 15, 14, 13$

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

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Example Question #1461 : Common Core Math: Grade 1

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

Possible Answers:

$\displaystyle 13$

$\displaystyle 15$

$\displaystyle 14$

$\displaystyle 11$

$\displaystyle 10$

Correct answer:

$\displaystyle 15$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 18$ and count back $\displaystyle 3$.

$\displaystyle 18, 17, 16, 15$

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

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Example Question #772 : Numbers And Operations

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

Possible Answers:

$\displaystyle 2$

$\displaystyle 3$

$\displaystyle 5$

$\displaystyle 1$

$\displaystyle 4$

Correct answer:

$\displaystyle 3$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 17$ and count back 14. $\displaystyle 14.$

$\displaystyle 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3$

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

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Example Question #773 : Numbers And Operations

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

Possible Answers:

$\displaystyle 11$

$\displaystyle 10$

$\displaystyle 7$

$\displaystyle 9$

$\displaystyle 8$

Correct answer:

$\displaystyle 10$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 16$ and count back $\displaystyle 6$.

$\displaystyle 16, 15, 14, 13, 12, 11, 10$

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

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Common Core: 1st Grade Math : Knowing How and When to Subtract

Study concepts, example questions & explanations for Common Core: 1st Grade Math

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #891 : Operations & Algebraic Thinking

Example Question #761 : Numbers And Operations

Example Question #891 : Operations & Algebraic Thinking

Example Question #1465 : Common Core Math: Grade 1

Example Question #1466 : Common Core Math: Grade 1

Example Question #1 : Knowing How And When To Subtract

Example Question #771 : Numbers And Operations

Example Question #1461 : Common Core Math: Grade 1

Example Question #772 : Numbers And Operations

Example Question #773 : Numbers And Operations

All Common Core: 1st Grade Math Resources

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