ZingPath: Proportions and Measurement

In this Activity Object, students learn to make reasonable estimates of time durations using a clock and make simple conversions involving the units of time.

Students have learned how to tell time, but it is important for students to understand the various measurements of time and also understand relationships among units and convert from one unit to another within the same system.

It is also important for students to be able to select, apply, and translate among mathematical representations to solve problems. The additional problems in the Independent Practice allow students to apply the math predictions and calculations to real life scenarios to solve problems related to reporting elapsed time.

Standard time conversions.

60 seconds = 1 minute

60 minutes = 1 hour or 360 seconds = 1 hour

24 hours = 1 day or 1,440 minutes = 1 day or 86,400 seconds = 1 day

Elapsed time with a clock.

It will be important to review the conversion of minutes to hours, and then seconds to minutes.

Converting minutes into hours and, when necessary, converting seconds into minutes is a practical way to determine elapsed time in the Activity Object. For the below clock, let the red point be placed on the fifteenth minute and the given time period be 2 hours 114 minutes 78 seconds. We can convert minutes and seconds into hours and minutes relatively.

Thus, the minute hand of the clock will pass over the red point four times.

The following key vocabulary terms will be used throughout this Activity Object:

hour - a measurement of time consisting of 60 minutes; 24 hours make up a full day

minute - a fraction of time, specifically one-sixth of an hour

second - a fraction of time, specifically one-sixth of a minute

time - a prescribed or allotted period; an interval