## Standard Form Exercise

1. Write the following numbers in standard form e.g. 3.24 × 103

 a. 83.2 b. 0.00963 c. 123.2 d. 10.32 e. 0.32 f. 854 000 g. 0.0435 h. 9.6 i. 541.7 j. 321 × 10 2 k. 6040 l. 3241 × 10 3

2. Write the following as ordinary numbers e.g. 345.3

 a. 23.4 × 102 b. 321 × 104 c. 0.23 × 102 d. 3402 × 10-2 e. 345 × 100 f. 0.34 × 101 g. 3200 × 102 h. 0.93 × 10-1 i. 45 × 102 j. 1.234 × 104 k. 9.3 × 108 l. 0.3 × 100

3. Use a calculator to find the following and leave the answer in standard form and round the answer to 2 significant figures:

a. 3467 × 23.56

b. (7.89 × 101) + (43.1 × 100)

c. (2.3 × 104) ÷ (61.9 × 102)

d. (34.56 × 102) x (78.9 × 103)

4. Write the following numbers in standard form:

 a. 73 500 000 000 000 000 000 tonnes The mass of the Earth b. 3754 m Height of Mt Cook, NZ's highest mountain c. US\$16, 548, 750 Most expensive diamond sold at auction d. 278, 564, 356, 980 eggs Number of hens eggs produced in China in 1997 e. 0.00002 mm Size of a typical virus f. 73,459 elephants Number of African Elephants in Tanzania in 1999 g. 0.000088% Weight of Earth's atmosphere as a percentage of its total mass h. 328 m Height of Auckland's Sky Tower. i. 0.5 kg Weight of eucalyptus leaves consumed daily by koala bears Figures from The Top 10 of Everything (Australian Edition 1999)by Russell Ash published by Dorling Kindersley