# Math in Focus Grade 3 Chapter 16 Answer Key Time and Temperature

This handy Math in Focus Grade 3 Workbook Answer Key Chapter 16 Time and Temperature provides detailed solutions for the textbook questions.

## Math in Focus Grade 3 Chapter 16 Answer Key Time and Temperature

Math Journal

Example

Question 1.
Here are the steps to do this subtraction exercise:
4 h 30 min – 2 h 45 min
Step 1: Regroup the 4 h to 3 h 60 min.
Step 2: Add 60 min to 30 min to get 90 min.
Step 3: Subtract 45 min from 90 min to get 45 min.
Step 4: Subtract 2 h from 3 h to get 1 h.
Step 5: Add 1 h and 45 min to get 1 h 45 min.

The steps to express time in hours and minutes are not in order.
Fill in the blanks.
320 min _____ h _____ min
Order the steps by writing the step numbers ¡n the boxes.
320 min is 5 h 20 min.
Subtract 300 min from 320 min to get 20 min.
Think 1 h = 60 mm, 5 h = 300 min. So, regroup 300 min to 5 h.
320 can be written as 300 and 20
300 min to hours=300/60=5
5 h 20 min.
Ordered in steps:
Step 1: Think 1 h = 60 mm, 5 h = 300 min. So, regroup 300 min to 5 h.
Step 2: Subtract 300 min from 320 min to get 20 min.
Step 3: 320 min is 5 h 20 min.

Question 2.
David wanted to find out how much time Garrett took to make a kite. Garrett started at 2:20 P.M. and ended at 5:05 P.M. David drew this timeline to help him find how much time had passed:

The time line did not help him. Can you improve the timeline so that it is easier for him to find how much time had passed?

The started time =2:20 PM
The ending time=5:05 PM
The elapsed time =?
There might be a chance of 3 h 25 min.

Question 3.
Imagine you and your friends are outdoors. The temperature is 90°F. Describe two activities you and your friends might want to do and the clothes that all of you should wear. Explain your thinking.
The temperature feels like 90°F then it is hot.
– Wear protective clothing. Lightweight, light-coloured and loose-fitting clothing helps protect against heat. Change clothing if it gets completed
– Stay hydrated. Drink plenty of fluids; drink about 16 ounces before starting and 5 to 7 ounces every 15 or 20 minutes.
– Avoid dehydrating liquids. Alcohol, coffee, tea and caffeinated soft drinks can hurt more than help.
– Schedule frequent breaks. Take time for rest periods and water breaks in a shaded or air-conditioned area.

Put on Your  Thinking Cap!

Challenging Practice

Solve.

Question 1.

Clock A is 25 minutes slow.
Clock B is 10 minutes fast.
a. What is the actual time?

From 9:35 we need to calculate up to 25 min.
We need to count forward for 25 min.
The 25 min from 9:35 is 10:00.

b. What is the time shown on Clock B?

The time is fast in the clock B.
We need to count back by 10 min.
So the time is 9:25.