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NSWMaths Standard 2Quick questions
Year 11: Working with Time
Quick questions on Units of time and 24-hour time for HSC Maths Standard 2
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is reading 24-hour time?Show answer
In 24-hour time the hours run from to and are always written with four digits, no am or pm. The minutes are unchanged; only the hour label differs. The rules are:
What is elapsed time?Show answer
Elapsed time is how long something lasts: the gap between a start time and a finish time. Within the same morning or afternoon you can count up in stages. The danger is when the period crosses noon (the am/pm change) or midnight (the day change), because you cannot just subtract the clock numbers. The reliable method is to split the period at the crossing:
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