Seconds/minutes/hours/days

Worked solution

1. 1

   Write the value of one minute.

   $1\text{minute}=60\text{seconds}$

   This is the relationship between the two time units.

2. 2

   Count two equal groups.

   $2\times 60=120$

   Two minutes have twice as many seconds as one minute.

3. 3

   Attach the new unit.

   $2\text{minutes}=120\text{seconds}$

   The number has changed because the answer counts smaller time units.

Worked solution

1. 1

   Change the hour into minutes.

   $1\text{hour}=60\text{minutes}$

   The hour must use the same unit as the extra 20 minutes.

2. 2

   Add the extra minutes.

   $60+20=80\text{minutes}$

   The two parts happen one after the other, so their durations add.

3. 3

   State the whole duration.

   $1\text{hour}20\text{minutes}=80\text{minutes}$

   All of the trip has now been counted in minutes.