Numbers (O'level Revision)

Write 257 964 correct to the nearest thousand.

• 258

• 260000

• 258000

• 257900

Write 0.060 31 correct to 2 significant figures.

• 0.06000

• 0.060

• 0.06

• 0.10

On Monday, the lowest temperature was –12 °C.

The highest temperature was 4 °C.

Work out the difference between these temperatures.

• 16 °C

• -8°C

• -16 °C

• 8 °C

On Tuesday, the highest temperature was –3 °C.

The lowest temperature was 8 °C lower than this.

Work out the lowest temperature on Tuesday.

• 5 °C.

• 11 °C.

• –11 °C.

• -5 °C.

In 2016, the population of Nigeria was 187 000 000.

Write 187 000 000 in standard form.

• $1.87\times10^8$

• $1.87\times10^{-8}$

• $1.87\times10^2$

• $1.87000$

Calculate.  $\frac{4.88-2.36}{5.3+1.9}$  

•  $4.5522$  

•  $2.375$  

•  $6.3347$  

•  $0.35$  

Calculate.
 $\sqrt{56.25}-^3\sqrt{15.625}$  

• 5

• 6.373

• 14.05

• 4.999

Write 56 as a product of its prime factors

• $56=2\times4\times7$

• $56=7\times8$

• $56=2^3\times7$

• $56=7\times2\times4$

Find the lowest common multiple (LCM) of 56 and 42.

• 186

• 168

• 24

• 42

Find the highest common factor (HCF) of 56 and 42.

• 186

• 14

• 168

• 28