Time, money and using a calculator

• Calculate with seconds, minutes, hours, days, weeks, months and years (1 year = 365 days).
• Use the 24-hour and 12-hour clocks: 3.15 a.m. is 0315 and 3.15 p.m. is 1515.
• Read clocks and timetables, including time zones and time differences.
• Calculate with money and convert between currencies.
• Use a calculator efficiently, enter values correctly and interpret the display (Paper 2).

Sixty, not one hundred

In the 24-hour clock, times after noon add 12 to the hour: 3.15 a.m. → 0315, 3.15 p.m. → 1515, 12.30 a.m. → 0030.

Add the journey time, then adjust for the clock change

Read a timetable across a row for a stop and down a column for one bus or train. For a flight between time zones, work out the arrival time in the departure city’s time first, then add or subtract the time difference.

Multiply one way, divide the other

Give money answers to 2 decimal places ($4.80, not $4.8). With an exchange rate “$1 = 3.67 dirhams”, multiply dollars by 3.67 to get dirhams; divide dirhams by 3.67 to get dollars. A quick check: the currency with more units per dollar should give the bigger number.

Brackets, stored values and one rounding at the end

The context decides what the number means