4.1 6 Put these numbers into order, starting with the highest. a –3, –2, –5 b –1, 1, 0 c –3, –3.3, –1.3 7 Put these numbers into order, starting with the lowest. a –0.8, 0.5, –1.2 b –1.5, 2.3, –5.9 c –3.3, –2.7, –3.8 8 Put these numbers into order, starting with the highest. a –4, –1, –6, –3 b –2, 2, 0, –1 c –4, –4.4, –2.5, 1 9 Write down the higher temperature in each pair. a –211 °C, –108 °C b –58 °C, –29 °C c –101 °C, –99 °C
d –73 °C, –61 °C
10 Write down the highest number in each set. a –5.5, –5.3, –5.6 b –7.5, –7.6, –7.9 c –4.2, –4.5, –4.1
t n e t n its o c d e e l o p t t m c Sa bje u S
Reason mathematically Worked example
Leo said, ‘–6 is larger than –4’. His sister said he was wrong.
How could she explain to Leo why he was wrong? She could draw a number line and place –6 and –4 onto the line, showing that –6 is further to the left than –4 and that the further left a number is on the line, the lower the number is. 11 Carla was told the temperature outside would drop by 5 °C that night. She said that it must be freezing outside then. Explain why she might be incorrect. 12 A submarine is at 40 metres below sea level. The captain is told to move to 20 metres below sea level. Does the captain move the submarine down or up? Give a reason for your answer 13 Explain how you know that –5.1 is higher than –5.9. 14 a Copy this bank statement. Then fill in the balance column. Date
Details
Debit (£)
31-01-2019 Opening balance 05-02-2019 Energy company 18-02-2019 Credit card
Credit (£)
Balance (£) 187.00
53.62 228.51
b Explain why the closing balance is negative.
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