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

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

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All Common Core: 1st Grade Math Resources

7 Diagnostic Tests 180 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #911 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}5\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

5, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}5\\ -\ 4\end{array}}{ \ \ \ \space 1}$

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Example Question #787 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}4\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

4, 3, 2

$\frac{\begin{array}[b]{r}4\\ -\ 2\end{array}}{ \ \ \ \space 2}$

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Example Question #781 : Numbers And Operations

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

Possible Answers:

Correct answer:

Explanation:

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

3,2,1,0

$\frac{\begin{array}[b]{r}3\\ -\ 3\end{array}}{ \ \ \ \space 0}$

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Example Question #782 : Numbers And Operations

$\frac{\begin{array}[b]{r}20\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

20,19,18,17,16,15

$\frac{\begin{array}[b]{r}20\\ -\ 5\end{array}}{ \ \ \space 15}$

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Example Question #1 : Understanding The Associative Property

Which is an example of associative property?

Possible Answers:

5+2=3 and 2+5=3

and

6+4+3=13 and 8+6=13

3+2=5 and 2+3=5

Correct answer:

and

Explanation:

The associative property says that you can group a set of numbers in a series, and still get the same answer. If we group 6+4 to get , and then add 10+3 we get a sum of .

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Example Question #2 : Understanding The Associative Property

Which is an example of associative property?

Possible Answers:

7+3+3=13 and 7+9=13

10+3=7 and 3+10=7

and

7+3=10 and 3+7=10

Correct answer:

and

Explanation:

The associative property says that you can group a set of numbers in a series, and still get the same answer. If we group 7+3 to get , and then add 10+3 we get a sum of .

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Example Question #281 : How To Add

Which is an example of associative property?

Possible Answers:

6+8+4=18 and 14+6=18

6+8=14 and 8+6=14

14+6=8 and 6+14=8

and

Correct answer:

and

Explanation:

The associative property says that you can group a set of numbers in a series, and still get the same answer. If we group 6+4 to get , and then add 10+8 we get a sum of .

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Example Question #4 : Understanding The Associative Property

Which is an example of associative property?

Possible Answers:

13+4=9 and 4+13=9

4+9=1 and 9+4=13

and

4+9+1=14 and 6+9=14

Correct answer:

and

Explanation:

The associative property says that you can group a set of numbers in a series, and still get the same answer. If we group 9+1 to get , and then add 10+4 we get a sum of .

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Example Question #1 : Understanding The Associative Property

Which is an example of associative property?

Possible Answers:

16+7=9 and 7+16=9

and

9+7+3=19 and 17+3=19

9+7=16 and 7+9=16

Correct answer:

and

Explanation:

The associative property says that you can group a set of numbers in a series, and still get the same answer. If we group 7+3 to get , and then add 10+9 we get a sum of .

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Example Question #1611 : How To Add

Which is an example of the associative property?

Possible Answers:

6+5=11 and 6=11-5

and

6+3=9 and 3+6=9

6+3+2=11 and 6+6=11

Correct answer:

and

Explanation:

The associative property says that, when you are only adding or only multiplying, the way you group the items in a series does not matter. Given 6 + 3 + 2 = 11, whether you group (6 + 3) + 2 or 6 + (3 + 2), the outcome does not change as the order in which you sum the numbers does not matter.

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All Common Core: 1st Grade Math Resources

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

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #911 : Operations & Algebraic Thinking

Example Question #787 : Ssat Elementary Level Quantitative (Math)

Example Question #781 : Numbers And Operations

Example Question #782 : Numbers And Operations

Example Question #1 : Understanding The Associative Property

Example Question #2 : Understanding The Associative Property

Example Question #281 : How To Add

Example Question #4 : Understanding The Associative Property

Example Question #1 : Understanding The Associative Property

Example Question #1611 : How To Add

All Common Core: 1st Grade Math Resources

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