Green Bridge Learning Resource For Calculations Involving Time

Overview

Time is the one quantity that refuses to work in tens. Sixty seconds in a minute, sixty minutes in an hour, twenty-four hours in a day: this base of sixty trips up anyone who treats a clock like a decimal number. Getting time arithmetic right is essential for timetables, schedules and any problem set in the real world.

In this lesson you will calculate with units of time, convert between the 12-hour and 24-hour clock, and read timetables to work out durations and arrival times. The key idea throughout is that time is counted in sixties, not tens, so a decimal answer must be read with care.

Lesson Evaluation

Congratulations on completing the lesson on Calculations Involving Time. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.

You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.

Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.

Write 7:45 pm in 24-hour form. A. 07:45 B. 17:45 C. 19:45 D. 19:75 Answer: C
A train leaves at 14:35 and arrives at 16:10. How long is the journey? A. 1 h 25 min B. 1 h 35 min C. 2 h 35 min D. 1 h 45 min Answer: B
How many minutes are there in 2.5 hours? A. 125 B. 150 C. 25 D. 250 Answer: B
Write 1 hour 45 minutes as a decimal number of hours. A. 1.45 B. 1.75 C. 1.45 h exactly D. 1.4 Answer: B
Write 06:20 in 12-hour form. A. 6:20 am B. 6:20 pm C. 18:20 D. 6:20 Answer: A