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.

Answer:

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?

Answer:

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.

Answer:

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?

Answer: 10:00

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?

Answer: 9:25

The time is fast in the clock B.

We need to count back by 10 min.

So the time is 9:25.

**Put On Your Thinking Cap!**

**Problem Solving**

Scientists in Snowland found that it is warmer in January than in July. It is warmer in July than in June. October is warmer than July but colder than January. List these months in order from warmest to coldest.

Answer:

The months which are warmer: January, July, October.

The months which are coldest: July, June, October.

The months from warmest to coldest: January, July, June, October.