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 #45 : Common Core Math: Grade 3

\(\displaystyle \frac{\begin{array}[b]{r}7\\ \times 10\end{array}}{ \ \ \ \space}\)

 

 

Possible Answers:

\(\displaystyle 56\)

\(\displaystyle 49\)

\(\displaystyle 63\)

\(\displaystyle 77\)

\(\displaystyle 70\)

Correct answer:

\(\displaystyle 70\)

Explanation:

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

\(\displaystyle 7\times10\) means adding \(\displaystyle 10\) seven times. 

\(\displaystyle 10+10+10+10+10+10+10=70\) and \(\displaystyle 7\times10=70\)

Or we can think of this as grouping objects. We have \(\displaystyle 7\) groups, with \(\displaystyle 10\) objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #202 : How To Multiply

\(\displaystyle \frac{\begin{array}[b]{r}8\\ \times 1\end{array}}{ \ \ \ \space}\)

 

 

Possible Answers:

\(\displaystyle 8\)

\(\displaystyle 16\)

\(\displaystyle 32\)

\(\displaystyle 24\)

\(\displaystyle 40\)

Correct answer:

\(\displaystyle 8\)

Explanation:

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

\(\displaystyle 8\times1\) means adding \(\displaystyle 1\) eight times. 

\(\displaystyle 1+1+1+1+1+1+1+1=8\) and \(\displaystyle 8\times1=8\)

Or we can think of this as grouping objects. We have \(\displaystyle 8\) groups, with \(\displaystyle 1\) object in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #51 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}9\\ \times 7\end{array}}{ \ \ \ \space}\)

 

 

Possible Answers:

\(\displaystyle 54\)

\(\displaystyle 45\)

\(\displaystyle 72\)

\(\displaystyle 81\)

\(\displaystyle 63\)

Correct answer:

\(\displaystyle 63\)

Explanation:

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

\(\displaystyle 9\times7\) means adding \(\displaystyle 7\) nine times. 

\(\displaystyle 7+7+7+7+7+7+7+7+7=63\) and \(\displaystyle 9\times7=63\)

Or we can think of this as grouping objects. We have \(\displaystyle 9\) groups, with \(\displaystyle 7\) objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #201 : How To Multiply

\(\displaystyle \frac{\begin{array}[b]{r}10\\ \times 9\end{array}}{ \ \ \ \space}\)

 

 

Possible Answers:

\(\displaystyle 50\)

\(\displaystyle 70\)

\(\displaystyle 80\)

\(\displaystyle 60\)

\(\displaystyle 90\)

Correct answer:

\(\displaystyle 90\)

Explanation:

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

\(\displaystyle 10\times9\) means adding \(\displaystyle 9\) ten times. 

\(\displaystyle 9+9+9+9+9+9+9+9+9+9=90\) and \(\displaystyle 10\times9=90\)

Or we can think of this as grouping objects. We have \(\displaystyle 10\) groups, with \(\displaystyle 9\) objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #52 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}11\\ \times 8\end{array}}{ \ \ \ \space}\)

 

 

Possible Answers:

\(\displaystyle 77\)

\(\displaystyle 66\)

\(\displaystyle 55\)

\(\displaystyle 99\)

\(\displaystyle 88\)

Correct answer:

\(\displaystyle 88\)

Explanation:

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

\(\displaystyle 11\times8\) means adding \(\displaystyle 8\) eleven times. 

\(\displaystyle 8+8+8+8+8+8+8+8+8+8+8=88\) and \(\displaystyle 11\times8=88\)

Or we can think of this as grouping objects. We have \(\displaystyle 11\) groups, with \(\displaystyle 8\) objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #53 : Operations & Algebraic Thinking

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

 

Possible Answers:

\(\displaystyle 96\)

\(\displaystyle 144\)

\(\displaystyle 108\)

\(\displaystyle 120\)

\(\displaystyle 132\)

Correct answer:

\(\displaystyle 144\)

Explanation:

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

\(\displaystyle 12\times12\) means adding \(\displaystyle 12\) twelve times. 

\(\displaystyle 12+12+12+12+12+12+12+12+12+12+12+12=144\) and \(\displaystyle 12\times12=144\)

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


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Example Question #54 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}1\\ \times 3\end{array}}{ \ \ \ \space}\)

 

 

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 1\)

\(\displaystyle 2\)

\(\displaystyle 3\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 3\)

Explanation:

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

\(\displaystyle 1\times3\) means adding \(\displaystyle 3\) one time. 

\(\displaystyle 3=3\) and \(\displaystyle 1\times3=3\)

Or we can think of this as grouping objects. We have \(\displaystyle 1\) group, with \(\displaystyle 3\) objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #51 : Representing And Solving Problems Involving Multiplication And Division

\(\displaystyle \frac{\begin{array}[b]{r}4\\ \times 8\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 16\)

\(\displaystyle 24\)

\(\displaystyle 32\)

\(\displaystyle 28\)

\(\displaystyle 20\)

Correct answer:

\(\displaystyle 32\)

Explanation:

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

\(\displaystyle 4\times8\) means adding \(\displaystyle 8\) four times. 

\(\displaystyle 8+8+8+8=32\) and \(\displaystyle 4\times8=32\)

Or we can think of this as grouping objects. We have \(\displaystyle 4\) groups, with \(\displaystyle 8\) objects in each group. We can count up the total number of objects, in this case triangles.

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Example Question #57 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}5\\ \times 12\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 60\)

\(\displaystyle 50\)

\(\displaystyle 45\)

\(\displaystyle 45\)

\(\displaystyle 55\)

Correct answer:

\(\displaystyle 60\)

Explanation:

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

\(\displaystyle 5\times12\) means adding \(\displaystyle 12\) five times. 

\(\displaystyle 12+12+12+12+12=60\) and \(\displaystyle 5\times12=60\)

Or we can think of this as grouping objects. We have \(\displaystyle 5\) groups, with \(\displaystyle 12\) objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #56 : Operations & Algebraic Thinking

\(\displaystyle \frac{\begin{array}[b]{r}6\\ \times 11\end{array}}{ \ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 88\)

\(\displaystyle 77\)

\(\displaystyle 99\)

\(\displaystyle 66\)

\(\displaystyle 110\)

Correct answer:

\(\displaystyle 66\)

Explanation:

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

\(\displaystyle 6\times11\) means adding \(\displaystyle 11\) six times. 

\(\displaystyle 11+11+11+11+11+11=66\) and \(\displaystyle 6\times11=66\)

Or we can think of this as grouping objects. We have \(\displaystyle 6\) groups, with \(\displaystyle 11\) objects in each group. We can count up the total number of objects, in this case triangles. 

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