## More Number Work Exercise

1. Write the following numbers in standard form:

 a 45.6 b 0.24 c 0.032 d 1541.7 e 843 000 f 0.000 002

2. Write the following numbers in standard form:

a. The distance around the equator is 12 756 kilometres.
b. The height of Mount Everest is 8 863 metres.
c. The size of a small virus is 0.000018 millimetres.
d. The density of hydrogen is 0.0871 grams per cubic centimetre.

3. Write the following numbers as ordinary decimals:

 a 5.12 × 102 b 4.1 × 10-1 c 1.6 × 104 d 6.1 × 106 e 9.61 × 10-3 f 8.3 × 10-6

4. Calculate:

 a 5⁄8 + 3⁄4 = b 4⁄5 + 3⁄4 = c 3⁄4 − 1⁄8 = d 43⁄8 + 21⁄4 = e 61⁄5 − 23⁄8 = f 26⁄7 − 17⁄8 = g 1⁄4 × 2⁄3 = h 5⁄11 × 7⁄9 = i 4⁄5 × 15⁄16 = j 75⁄99 × 33⁄100 = k 31⁄2 × 41⁄4 = l 13⁄8 × 21⁄4 = m 3⁄4 ÷ 1⁄2 = n 8⁄9 ÷ 4⁄9 = o 4⁄5 ÷ 2⁄3 = p 31⁄2 ÷ 7⁄8 = q 14⁄5 ÷ 9⁄10 = r 3⁄4 ÷ 3 =

5.

 a Increase 95 by 20% b Decrease 90 by 10% c Increase 150 by 40% d Increase 500 by 45% e Decrease 540 by 5% f Decrease 250 by 50%

6. a. The price of a spa pool is decreased by 20%. It was originally priced at \$3500. What is its new price?

b. The cost of a DVD is \$45. If tax has to be added on at 12.5% what is its new cost?