Quiz for grade 8

  $Evaluate\ :\ 55−(1+4)×4$  

• 200

• 35

• 232

• 75

Which of the following is the expanded form of $5𝑥(3𝑥+10𝑦)$  

•  $15𝑥^2+50𝑥y$  

•  $15𝑥+50𝑥y$  

•  $8𝑥^2+15𝑥y$  

•  $8𝑥+15𝑥y$  

Fully factorise the following expression.  $8𝑦z^2−16𝑦^3$  

•  $8𝑦(𝑧^2−2𝑦)$  

•  $8𝑦(𝑧^2−2𝑦^2)$  

•  $8𝑦^2(𝑧^2−2𝑦^2)$  

•  $8𝑦𝑧(𝑧−2𝑦^2)$  

Which decimal describes the shaded part of this shape?

• 0.6

• 0.75

• 6.0

• 7.5

Which of the following line is parallel to $𝑦=3𝑥+4$  

•  $𝑦+3𝑥=4$  

•  $𝑦−\ \frac{1}{3}𝑥=2$  

•  $𝑦-3x=4$  

•  $y=6𝑥+4$  

Simplify the expression  $x^2×𝑥^8$  

•  $𝑥^{16}$  

•  $𝑥^{10}$  

•  $𝑥^{64}$  

•  $𝑥^{256}$  

Simplify the expression  $\left(𝑦^2\right)^8$  

•  $𝑦^{16}$  

•  $𝑦^{256}$  

•  $𝑦^{10}$  

•  $𝑦^{64}$  

In a class of 42 students, the ratio of male : female is 2 ∶ 4. How many females are there?

• 14

• 28

• 40

• 42

Write the number 742,000 in standard form.

•  $74200\times10^1$  

•  $742\times10^3$  

•  $74.2\times\times10^4$  

•  $7.42\times10^5$  

 $6.3×10^{-3}$ 
write as an ordinary number

• 63000

• 6300

• 0.0063

•  $-0.0063$