# Lesson 12 Hours, Minutes, and Seconds

Let’s explore time in hours, minutes, and seconds.

## Warm-up What Do You Know About …?

What do you know about 1 hour?

## Activity 1 Mai’s School Day

The table shows how Mai spends the time she is awake on a school day.

Complete the table to show how many minutes Mai spends on each activity. Be prepared to explain or show your reasoning.

activity

hours

minutes

morning routine

getting to school

time at school

getting home from school

homework and reading

playing and family time

bedtime routine

How many hours does Mai spend at school? How many minutes is that? Explain or show how you know.

How many minutes does Mai sleep on a school night? Explain or show your reasoning.

## Activity 2 Precious Minutes and Seconds

Diego set a timer to make sure that things are not done for too long or too short an amount of time.

Complete the table with the number of seconds for each activity. Be prepared to explain your reasoning.

activity

minutes

seconds

brushing teeth

showering

heating a cup of milk in the microwave

break during homework time

quick workout

daily reading

Diego noticed that on a television channel, commercial breaks are often between

and minutes long each. How long are they in seconds? Explain or show your reasoning. Diego’s workout starts with 4 minutes of warm-up and stretching, followed by 100 seconds of jumping jacks.

If he works out for 10 minutes exactly, how many more seconds are left in his workout?

## Practice Problem

## Problem 1

Diego said it took him 1,800 seconds to get home from school yesterday. Lin thinks he is exaggerating.

It took Diego

hour to get home from school yesterday. How many minutes is that? Explain your reasoning. How many seconds is that? Explain or show your reasoning.

Was Diego’s statement correct or is he exaggerating?