ISEE Lower Level Quantitative : Numbers and Operations

Study concepts, example questions & explanations for ISEE Lower Level Quantitative

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Example Questions

Example Question #2 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}12\\ \times 3\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 48\)

\(\displaystyle 60\)

\(\displaystyle 36\)

\(\displaystyle 12\)

\(\displaystyle 24\)

Correct answer:

\(\displaystyle 36\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 12\times3\) means adding \(\displaystyle 3\) twelve times. 

\(\displaystyle 3+3+3+3+3+3+3+3+3+3+3+3=36\) and \(\displaystyle 12\times3=36\)

Or we can think of this as grouping objects. We have \(\displaystyle 12\) groups, with \(\displaystyle 3\) objects in each group. We can count up the total number of objects, in this case triangles. Screen shot 2015 08 18 at 8.00.16 am

Example Question #1 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}1\\ \times 9\end{array}}{ \ \ \ \space}\)

 

 

Possible Answers:

\(\displaystyle 36\)

\(\displaystyle 27\)

\(\displaystyle 18\)

\(\displaystyle 1\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 9\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 1\times9\) means adding \(\displaystyle 9\) one time. 

\(\displaystyle 9=9\) and \(\displaystyle 1\times9=9\)

Or we can think of this as grouping objects. We have \(\displaystyle 1\) group, with \(\displaystyle 9\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 18 at 8.03.43 am

Example Question #11 : Common Core Math: Grade 3

\(\displaystyle \frac{\begin{array}[b]{r}6\\ \times 4\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 24\)

\(\displaystyle 12\)

\(\displaystyle 18\)

\(\displaystyle 16\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 24\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 6\times4\) means adding \(\displaystyle 4\) six times. 

\(\displaystyle 4+4+4+4+4+4=24\) and \(\displaystyle 6\times4=24\)

Or we can think of this as grouping objects. We have \(\displaystyle 6\) groups, with \(\displaystyle 4\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 17 at 9.13.46 pm

Example Question #113 : How To Multiply

\(\displaystyle \frac{\begin{array}[b]{r}1\\ \times 4\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 4\)

\(\displaystyle 16\)

\(\displaystyle 1\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 4\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 1\times4\) means adding \(\displaystyle 4\) one time. 

\(\displaystyle 4=4\) and \(\displaystyle 1\times4=4\)

Or we can think of this as grouping objects. We have \(\displaystyle 1\) group, with \(\displaystyle 4\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 18 at 8.09.43 am

Example Question #12 : Common Core Math: Grade 3

Solve the following: 

\(\displaystyle \frac{\begin{array}[b]{r}3\\ \times1 2\end{array}}{ \ \ \ \space}\)

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 60\)

\(\displaystyle 24\)

\(\displaystyle 36\)

\(\displaystyle 48\)

Correct answer:

\(\displaystyle 36\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 3\times12\) means adding \(\displaystyle 12\) three times. 

\(\displaystyle 12+12+12=36\) and \(\displaystyle 3\times12=36\)

Or we can think of this as grouping objects. We have \(\displaystyle 3\) groups, with \(\displaystyle 12\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 18 at 8.21.29 am

Example Question #115 : How To Multiply

\(\displaystyle \frac{\begin{array}[b]{r}4\\ \times 5\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 24\)

\(\displaystyle 16\)

\(\displaystyle 32\)

\(\displaystyle 20\)

\(\displaystyle 28\)

Correct answer:

\(\displaystyle 20\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 4\times5\) means adding \(\displaystyle 5\) four times. 

\(\displaystyle 5+5+5+5=20\) and \(\displaystyle 4\times5=20\)

Or we can think of this as grouping objects. We have \(\displaystyle 4\) groups, with \(\displaystyle 5\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 18 at 8.26.03 am

Example Question #211 : Operations

\(\displaystyle \frac{\begin{array}[b]{r}5\\ \times 7\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 30\)

\(\displaystyle 35\)

\(\displaystyle 20\)

\(\displaystyle 25\)

Correct answer:

\(\displaystyle 35\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 5\times7\) means adding \(\displaystyle 7\) five times. 

\(\displaystyle 7+7+7+7+7=35\) and \(\displaystyle 5\times7=35\)

Or we can think of this as grouping objects. We have \(\displaystyle 5\) groups, with \(\displaystyle 7\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 18 at 8.32.41 am

Example Question #211 : Numbers And Operations

\(\displaystyle \frac{\begin{array}[b]{r}7\\ \times 3\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 35\)

\(\displaystyle 21\)

\(\displaystyle 14\)

\(\displaystyle 14\)

\(\displaystyle 28\)

Correct answer:

\(\displaystyle 21\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 7\times3\) means adding \(\displaystyle 3\) seven times. 

\(\displaystyle 3+3+3+3+3+3+3=21\) and \(\displaystyle 7\times3=21\)

Or we can think of this as grouping objects. We have \(\displaystyle 7\) groups, with \(\displaystyle 3\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 18 at 8.39.21 am

Example Question #171 : How To Multiply

\(\displaystyle \frac{\begin{array}[b]{r}9\\ \times 3\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 36\)

\(\displaystyle 27\)

\(\displaystyle 45\)

\(\displaystyle 63\)

\(\displaystyle 72\)

Correct answer:

\(\displaystyle 27\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 9\times3\) means adding \(\displaystyle 3\) nine times. 

\(\displaystyle 3+3+3+3+3+3+3+3+3=27\) and \(\displaystyle 9\times3=27\)

Or we can think of this as grouping objects. We have \(\displaystyle 9\) groups, with \(\displaystyle 3\) objects in each group. We can count up the total number of objects, in this case triangles.

Screen shot 2015 08 18 at 8.50.36 am

Example Question #11 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}11\\ \times 11\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 111\)

\(\displaystyle 121\)

\(\displaystyle 88\)

\(\displaystyle 99\)

\(\displaystyle 77\)

Correct answer:

\(\displaystyle 121\)

Explanation:

Multiplication can be thought of as repeated addition, or as objects in a group. 

\(\displaystyle 11\times11\) means adding \(\displaystyle 11\) eleven times. 

\(\displaystyle 11+11+11+11+11+11+11+11+11+11+11+=121\) and \(\displaystyle 11\times11=121\)

Or we can think of this as grouping objects. We have \(\displaystyle 11\) groups, with \(\displaystyle 11\) objects in each group. We can count up the total number of objects, in this case triangles. 

Screen shot 2015 08 18 at 9.00.11 am

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