Year 2: Minutes in an hour and hours in a day

Method. Use the fact that 1 hour has 60 minutes. Multiply for more hours.

1. Remember the fact. There are 60 minutes in 1 hour.
   1 hour = 60 minutes
2. Look at the clock. The long hand goes all the way round once in one hour.
   Long hand all the way round
3. Write the answer.
   60

Check. Share the answer back: 60 ÷ 60 = 1 hours. ✓

Watch out. An hour is 60 minutes, not 100 minutes.

Method. Share the 60 minutes of one hour into 2 equal parts.

1. Start with 1 hour. There are 60 minutes in 1 hour.
   60 minutes
2. Share it into 2 equal parts. Half an hour is one of the 2 equal parts.
   60 ÷ 2 = 30
3. Write the answer.
   30

Check. 30 minutes, 2 times, makes 60 minutes: 30 × 2 = 60. ✓

Watch out. Half is 2 equal parts. A quarter is 4 equal parts. Check the parts add up to 1 hour.

Method. Share the 60 minutes of one hour into 4 equal parts.

1. Start with 1 hour. There are 60 minutes in 1 hour.
   60 minutes
2. Share it into 4 equal parts. A quarter of an hour is one of the 4 equal parts.
   60 ÷ 4 = 15
3. Write the answer.
   15

Check. 15 minutes, 4 times, makes 60 minutes: 15 × 4 = 60. ✓

Watch out. Half is 2 equal parts. A quarter is 4 equal parts. Check the parts add up to 1 hour.

Method. Use the fact that 1 hour has 60 minutes. Multiply for more hours.

1. Remember the fact. There are 60 minutes in 1 hour.
   1 hour = 60 minutes
2. Multiply by 2. 2 hours is 2 lots of 60 minutes.
   2 × 60 = 120
3. Write the answer.
   120

Check. Share the answer back: 120 ÷ 60 = 2 hours. ✓

Watch out. An hour is 60 minutes, not 100 minutes.

Method. Count the jumps from 12 to the number. Each jump is 5 minutes.

1. Count the jumps. Each jump goes from one number to the next.
   3 jumps from 12 to 3
2. Each jump is 5 minutes. Multiply the jumps by 5.
   3 × 5 = 15
3. Write the answer.
   15

Check. Count on from 12 in fives: 5, 10, ... up to 15. ✓

Watch out. Count in fives, not in ones, when you move round a clock.

Method. Count the hours in a day. Each square is one hour.

1. Count the squares. Each yellow square is one hour.
   24 squares
2. Remember the fact. A day has 24 hours.
   1 day = 24 hours
3. Write the answer.
   24

Check. Count again in tens and fours: 10 + 10 + 4 = 24. ✓

Watch out. A day has 24 hours, not 12. The clock shows 12 hours twice in a day.

Method. A day has 24 hours. Multiply by the number of days.

1. Remember the fact. There are 24 hours in 1 day.
   1 day = 24 hours
2. Multiply by 2. 2 days is 2 lots of 24 hours.
   2 × 24 = 48
3. Write the answer.
   48

Check. Share the answer back: 48 ÷ 24 = 2 days. ✓

Watch out. Multiply the hours in one day by the number of days.

Method. Half a day is half of 24 hours.

1. Start with 24 hours. There are 24 hours in 1 day.
   24 hours
2. Share it into 2 equal parts. Half a day is one of the 2 equal parts.
   24 ÷ 2 = 12
3. Write the answer.
   12

Check. Two halves of 12 hours make 24 hours. ✓

Watch out. Half a day is 12 hours. It is not 6 hours.

Method. Work out the time, then decide if the claim is right.

1. Work it out. Use the clock or the numbers.
   1 hour = 60 minutes. 60 is not 100.
2. Compare with what is said. Ali says there are 100 minutes in 1 hour.
   It does not match
3. Decide. There are 60 minutes in 1 hour, so Ali is not right.
   No

Check. Check it again: 1 hour = 60 minutes. 60 is not 100.. ✓

Watch out. Check the hour and the minutes, not just one of them.

Method. Work out the time, then decide if the claim is right.

1. Work it out. Use the clock or the numbers.
   3 hours = 3 × 60 = 180 minutes
2. Compare with what is said. Is 180 minutes more than 150 minutes?
   It matches
3. Decide. 180 is more than 150, so 3 hours is more than 150 minutes.
   Yes

Check. Check it again: 3 hours = 3 × 60 = 180 minutes. ✓

Watch out. Check the hour and the minutes, not just one of them.