How_To_Be_Good_At_Math

196

It’s simple to add, subtract, multiply, or divide an amount

of time. As with other measurements, we just need to

make sure the numbers are in the same units.

Calculating

with time

MEASUREMENT • CALCULATING WITH TIME MEASUREMENT • CALCULATING WITH TIME

It’s 2.50 p.m. A robot is going

to go on the big wheel, then

walk to the exit of the fairground.

Let’s calculate what time it will be

when the robot gets to the exit.

First, we need to add up the

time for each part of the

journey. The queue for the big

wheel is 8 minutes long, the ride

lasts 6 minutes, and it takes

2 minutes to walk to the

fairground exit. Let's add these

times up: 8 + 6 + 2 = 16

Next, we add on minutes to

2.50 p.m. to take us to the

next hour. Adding 10 minutes to

2.50 p.m. takes it to 3 p.m.

Finally, we add on the

6 minutes that are left

over, taking the time to

6 minutes past 3.

So, the robot reaches

the exit of the fairground

at 3.06 p.m.

Calculating time

with the same units

If times are measured in the same

units, it's easy to add and subtract

them. But when we count on from

a start time, we have to remember

to count up to the nearest minute,

hour, or day and then add on any

remaining time.

When calculating with

time, make sure you

convert the times so that

they are all in the same

unit before you

calculate.

EXIT

196-197_Calculating_with_time.indd 196 29/02/2016 18:04