How to multiply variables

Practice Questions

ISEE Middle Level Quantitative Reasoning › How to multiply variables

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1

Mulitply:

2

Define an operation on the real numbers as follows:

For all real values of and ,

$a \bigstar b = ab-a$

is a positive number. Which is the greater quantity?

(a) $N \bigstar (-N)$

(b) $(-N) \bigstar N$

3

$\frac{\begin{array}[b]{r}20\ \times\ 6\end{array}}{ \ \ \ \space}$

4

Solve the following:

$\frac{\begin{array}[b]{r}70\ \times\ 7\end{array}}{ \ \ \ \space}$

5

Which quantity is greater?

$(a)\ -4(x^{2}+2x-10)$

$(b)\ -4x^2-8x-40$

6

Which quantity is greater?

$(a)\ (9)^{-2}$

$(b)\ (-3)^{-4}$

7

Which of the following is equivalent to $6t \cdot 7t$ ?

8

Which of the following is equivalent to ?

9

Which quantity is greater?

$(a)\ -3(x^3+1)$

$(b)\ 3(-x^3+1)$

10

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

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