ISEE Lower Level Quantitative : How to multiply

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

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Example Questions

Example Question #2941 : Numbers And Operations

\displaystyle \frac{\begin{array}[b]{r}11\\ \times 7\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 55

\displaystyle 44

\displaystyle 66

\displaystyle 77

\displaystyle 33

Correct answer:

\displaystyle 77

Explanation:

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

\displaystyle 11\times7 means adding \displaystyle 7 eleven times. 

\displaystyle 7+7+7+7+7+7+7+7+7+7+7=77 and \displaystyle 11\times7=77

Or we can think of this as grouping objects. We have \displaystyle 11 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 #111 : Operations & Algebraic Thinking

\displaystyle \frac{\begin{array}[b]{r}12\\ \times 10\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 96

\displaystyle 84

\displaystyle 72

\displaystyle 120

\displaystyle 108

Correct answer:

\displaystyle 120

Explanation:

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

\displaystyle 12\times10 means adding \displaystyle 10 twelve times. 

\displaystyle 10+10+10+10+10+10+10+10+10+10+10+10=120and \displaystyle 12\times10=120

Or we can think of this as grouping objects. We have \displaystyle 12 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 #211 : How To Multiply

\displaystyle \frac{\begin{array}[b]{r}1\\ \times 11\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 9

\displaystyle 11

\displaystyle 8

\displaystyle 12

\displaystyle 10

Correct answer:

\displaystyle 11

Explanation:

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

\displaystyle 1\times11 means adding \displaystyle 11 one time. 

\displaystyle 11=11 and \displaystyle 1\times11=11

Or we can think of this as grouping objects. We have \displaystyle 1 group, with \displaystyle 11 objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #111 : Operations & Algebraic Thinking

\displaystyle \frac{\begin{array}[b]{r}2\\ \times 12\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 16

\displaystyle 18

\displaystyle 22

\displaystyle 24

\displaystyle 20

Correct answer:

\displaystyle 24

Explanation:

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

\displaystyle 2\times12 means adding \displaystyle 12 two times. 

\displaystyle 12+12=24 and \displaystyle 2\times12=24

Or we can think of this as grouping objects. We have \displaystyle 2 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 #311 : Operations

\displaystyle \frac{\begin{array}[b]{r}3\\ \times 11\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 27

\displaystyle 24

\displaystyle 36

\displaystyle 33

\displaystyle 30

Correct answer:

\displaystyle 33

Explanation:

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

\displaystyle 3\times11 means adding \displaystyle 11 three times. 

\displaystyle 11+11+11=33 and \displaystyle 3\times11=33

Or we can think of this as grouping objects. We have \displaystyle 3 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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Example Question #115 : Operations & Algebraic Thinking

\displaystyle \frac{\begin{array}[b]{r}7\\ \times 1\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 14

\displaystyle 35

\displaystyle 7

\displaystyle 28

\displaystyle 21

Correct answer:

\displaystyle 7

Explanation:

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

\displaystyle 7\times1 means adding \displaystyle 1 seven times. 

\displaystyle 1+1+1+1+1+1+1=7 and \displaystyle 7\times1=7

Or we can think of this as grouping objects. We have \displaystyle 7 groups, with \displaystyle 1 objects in each group. We can count up the total number of objects, in this case triangles. 

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Example Question #116 : Operations & Algebraic Thinking

\displaystyle \frac{\begin{array}[b]{r}7\\ \times 12\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 77

\displaystyle 70

\displaystyle 56

\displaystyle 63

\displaystyle 84

Correct answer:

\displaystyle 84

Explanation:

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

\displaystyle 7\times12 means adding \displaystyle 12 seven times. 

\displaystyle 12+12+12+12+12+12+12=84 and \displaystyle 7\times12=84

Or we can think of this as grouping objects. We have \displaystyle 7 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 #312 : Operations

\displaystyle \frac{\begin{array}[b]{r}8\\ \times 12\end{array}}{ \ \ \ \space}

 

Possible Answers:

\displaystyle 72

\displaystyle 64

\displaystyle 80

\displaystyle 88

\displaystyle 96

Correct answer:

\displaystyle 96

Explanation:

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

\displaystyle 8\times12 means adding \displaystyle 12 eight times. 

\displaystyle 12+12+12+12+12+12+12+12=96 and \displaystyle 8\times12=96

Or we can think of this as grouping objects. We have \displaystyle 8 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 #111 : Common Core Math: Grade 3

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

 

Possible Answers:

\displaystyle 63

\displaystyle 71

\displaystyle 99

\displaystyle 90

\displaystyle 81

Correct answer:

\displaystyle 81

Explanation:

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

\displaystyle 9\times9 means adding \displaystyle 9 nine times. 

\displaystyle 9+9+9+9+9+9+9+9+9=81 and \displaystyle 9\times9=81

Or we can think of this as grouping objects. We have \displaystyle 9 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 #112 : Common Core Math: Grade 3

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

 

Possible Answers:

\displaystyle 77

\displaystyle 60

\displaystyle 40

\displaystyle 70

\displaystyle 50

Correct answer:

\displaystyle 70

Explanation:

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

\displaystyle 10\times7 means adding \displaystyle 7 ten times. 

\displaystyle 7+7+7+7+7+7+7+7+7+7=70 and \displaystyle 10\times7=70

Or we can think of this as grouping objects. We have \displaystyle 10 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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