Class 5 · Math · No. 18
Time: racing seconds
Stopwatch, jumps and the 24-hour clock
Some things take hours, some only seconds. In this chapter you will time yourself with a stopwatch, count the time from start to finish in jumps, and read the clock the 24-hour way that trains and buses use.
Think about it
Three children all finished a race in “1 minute”. How can we tell who won?
In this chapter
- §1Racing seconds
- §2How long did it take?
- §3The 24-hour clock
- ★Practice: 8 questions
- ◆Olympiad challenge: 4 questions
- ✓Recap: remember this
Class 5 plan
This chapter opens with the Class 5 plan
One chapter in every class is free to try. The rest of Class 5, Math and Science, opens with a plan for the year.
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Plate ITime: racing seconds