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1b Multiply and divide by 10, 100 or 1000 1c Negative numbers example example a Calculate 7.32 ⫻ 100 b Find the missing number in 84.2 ⫼ ? ⫽ 0.0842 a 7.32 ⫻ 100 ⫽ 732 The digits move two places to the left. b 84.2 ⫼ 1000 ⫽ 0.0842 The digits have moved three places to the right, so 84.2 has been divided by 1000. 1 Use number patterns to copy and complete these statements. ⫻ 10 ⫽ 2.5 b 87 ⫼ 10 ⫽ a 0.25 ⫻ ⫽ 25 87 ⫼ ⫽ 0.87 0.25 ⫻ 1000 ⫽ ⫼ 1000 ⫽ 0.087 2 Calculate each of these. a 14 ⫻ 10 c 3 ⫻ 1000 e 2.8 ⫻ 1000 g 34.5 ⫻ 100 b d f h 5 ⫻ 100 5.2 ⫻ 10 4.36 ⫻ 10 0.63 ⫻ 10 3 Calculate each of these. a 280 ⫼ 10 c 23 000 ⫼ 1000 e 410 ⫼ 100 g 1.9 ⫼ 10 b d f h 5000 ⫼ 100 165 ⫼ 10 52.7 ⫼ 10 846 ⫼ 1000 4 By writing each multiplier as two of its factors, calculate these. a 5 ⫻ 20 ⫽ 5 ⫻ 2 ⫻ ⫽ b 3 ⫻ 900 ⫽ 3 ⫻ ⫻ 100 ⫽ c 7 ⫻ 40 ⫽ 7 ⫻ ⫻ ⫽ d 11 ⫻ 500 ⫽ e 12 ⫻ 70 ⫽ f 15 ⫻ 400 ⫽ 2 Number Multiply and divide by 10, 100 or 1000 Josiah has £100 in his bank account. What will his balance be if he withdraws £250? £100 ⫺ £250 ⫽ -£150, so he will be £150 overdrawn. 1 Put these numbers in order from lowest to highest. a -3 8 4 0 -15 b -24 6 -16 -17 1 c 4 -3 2 3 -9 2 Work out these. a 5 ⫺ 10 b 9 – 12 e 10 ⫹ -16 f -5 ⫹ -11 i -12 ⫺ -4 j 15 ⫺ -6 c 15 ⫹ -9 g -4 ⫺ -9 k 19 ⫺ -5 d 5 + -9 h -12 ⫺ -16 l -20 ⫺ -8 3 Candace’s bank balance is -£ 250. Find what her balance would be if she paid in a £100 b £ 200 c £ 400 d £ 500. 4 Kanika recorded the midday temperature outside her house on each day of one week. Monday Tuesday Wednesday Thursday Friday Saturday Sunday 9 °C 4 °C -2 °C -5 °C -3 °C 3 °C 6 °C a Find the fall in temperature from i Monday to Tuesday ii Tuesday to Wednesday b Find the rise in temperature from i Thursday to Friday ii Friday to Saturday Number Negative numbers 3