Now have a go yourself .. . . How to . . . Standard (index) form a) Write 8.2 x 10 5 as an ordinary number. (1) b) Write 0.000 376 in standard form. (1) c) Work out the value of (2.3 x 10 12 ) ÷ (4.6 x 10 3 ) Give your answer in standard form. (2) MUST - Write the following in standard form a) 5000 b) 700,000 c) 600 d) 82,000 e) 43,000 f) 561,000 g) 56 h) 34.7 i) 60 j) 0.00056 k) 0.005 l) 0.04 m) 0.000 007 n) 0.9 o) 0.008 p) 0.0047 q) 0.987 r) 0.000 803 4 SHOULD - Write the following as ordinary numbers a) 6 x 10 5 b) 1 x 10 4 c) 8 x 10 5 d) 3.96 x 10 4 e) 6.8 x 10 7 f) 8.02 x 10 3 g) 5.7 x 10 1 h) 9.23 x 10 0 i) 4.56 x 10 3 j) 6 x 10 -5 k) 8 x 10 -2 l) 5 x 10 -7 m) 3 x 10 -1 n) 8.43 x 10 -5 o) 2.01 x 10 -2 p) 7.854 x 10 -1 q) 9.4 x 10 -4 r) 6.12 x 10 -3 COULD - Work out the following write your answers in standard form a) (3 x 10 6 ) x (4 x 10 3 ) b) (6 x 10 5 ) x (1.5 x 10 3 ) c) (4 x 10 -7 ) x (3 x 10 5 ) d) (4 x 10 8 ) x (2 x 10 3 ) e) (8.6 x 10 8 ) ÷ (2 x 10 13 ) f) (1 x 10 12 ) ÷ (4 x 10 3 ) g) (7 x 10 -9 ) ÷ (7 x 10 -5 ) h) (2 x 10 5 ) 2 Use a calculator for the following: i) (3.4 x 10 6 ) x (7.1 x 10 4 ) j) (4.56 x 10 8 )÷(3.2 x 10 -3 ) k) (3.5 x 10 11 ) ÷ (6.5 x 10 16 ) www.justmaths.co.uk ©JustMaths 2013