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Step-by-step practice: Maths · Level 4Chapter 8 · Time to the minute
Step-by-step Maths Level 4 · Time to the minute · Lesson 8.3

Step-by-step Maths Level 4: Converting between hours and minutes

Part of the Step-by-step Maths Level 4 time to the minute chapter. Chapter overview · whole chapter on one page

8.3

Converting between hours and minutes

Level 4
Convert between hours and minutes, for example 2 hours 35 minutes = 155 minutes

There are 60 minutes in 1 hour. To change hours to minutes, multiply by 60 and add any extra minutes.

To change minutes to hours and minutes, divide by 60. The number of whole hours is the answer, and the remainder is the minutes.

Key ideas

  • 1 hour = 60 minutes.
  • Hours to minutes: multiply by 60, then add the extra minutes.
  • Minutes to hours: divide by 60; the remainder is the minutes.
Worked example 8.3.1
How many minutes are in 2 hours and 35 minutes?

Method. There are 60 minutes in an hour. Change the hours to minutes, then add the extra minutes.

  1. Change 2 hours to minutes. There are 60 minutes in 1 hour.
    2 × 60 = 120
  2. Add the minutes. Put the extra 35 minutes on the end.
    120 + 35 = 155
  3. Write the answer. This is the total number of minutes.
    155

Check. Check: 155 minutes is 2 hours and 35 minutes.

Watch out. Do not write 2 hours 35 minutes as 235.

Worked example 8.3.2
Write 190 minutes as hours and minutes.

Method. There are 60 minutes in an hour. Divide by 60 to find the hours, and the remainder is the minutes.

  1. Count how many whole hours there are. Every 60 minutes is 1 hour.
    190 ÷ 60 = 3 remainder 10
  2. Find the minutes left over. The remainder is the extra minutes.
    190 - 180 = 10
  3. Write the answer. Say the hours, then the minutes.
    3 hours 10 minutes

Check. Check: 3 hours is 180 minutes and 10 more is 190.

Watch out. Do not write 190 minutes as 1 hour 90 minutes.

Worked example 8.3.3
Write 125 minutes as hours and minutes.

Method. There are 60 minutes in an hour. Divide by 60 to find the hours.

  1. Count how many whole hours there are. Two full hours are 120 minutes.
    125 ÷ 60 = 2 remainder 5
  2. Find the minutes left over. The remainder is the extra minutes.
    125 - 120 = 5
  3. Write the answer. Say the hours, then the minutes.
    2 hours 5 minutes

Check. Check: 2 hours is 120 minutes and 5 more is 125.

Watch out. Check the remainder is less than 60.

Watch out

Watch out. 2 hours 35 minutes is 155 minutes, not 235 minutes. Multiply the hours by 60 first.

Exam tip

Grown-up tip. Ask the child to count in sixties: 60, 120, 180, to get the number of minutes in whole hours.

Exercise 8C  Practice: hours and minutes

Non-calculator
1
FWrite 229 minutes as hours and minutes.
2
FWrite 192 minutes as hours and minutes.
3
FWrite 75 minutes as hours and minutes.
4
FHow many minutes are in 2 hours and 17 minutes?
5
FWrite 169 minutes as hours and minutes.
6
FWrite 222 minutes as hours and minutes.
7
FWrite 64 minutes as hours and minutes.
8
FWrite 252 minutes as hours and minutes.
9
FWrite 111 minutes as hours and minutes.
10
FWrite 249 minutes as hours and minutes.
11
FHow many minutes are in 3 hours and 37 minutes?
12
FHow many minutes are in 1 hour and 41 minutes?
13
FHow many minutes are in 5 hours and 29 minutes?
14
FWrite 143 minutes as hours and minutes.
15
FHow many minutes are in 4 hours and 6 minutes?
16
FHow many minutes are in 2 hours and 47 minutes?

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