Open up your notes at page 2, note,Scientific Notation, and collect a highlighter or coloured pen.

Prefixes milli is shortened to m. It means divide by or add x10 -3 to the number. e.g. 23 mA = 23x10 -3 A. micro is shortened to . It means divide by or add x e.g. 23  A = 23 x10 -6 A. nano is shortened to n. It means divide by or add x10 -9 to the number. e.g. 23 nA = 23x10 -9 A. kilo is shortened to k. It means multiply by or add x10 3 to the number. e.g. 23 kA = 23x10 3 A. mega is shortened to M. It means multiply by or add x10 6 to the number. e.g. 23 MA = 23x10 6 A. giga is shortened to G. It means multiply by or add x10 9 to the number. e.g. 23 G A = 23x10 9 A.

t = ? v = 3 x 10 8 ms -1 d = 2.5 km = 2.5 x 10 3 m t = d v = 2.5 x x 10 8 = s or 8.3 x s

Continue with problems, pages 3 to 4. If not finished by the end of the period…. finish for Tuesday. Write in homework diary. Next day...Echo problems on pages 5 – 7.