Units Of Measurement Worksheets Page 5

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Units of time
weeks
× 7
÷ 7
We use a more complicated system of units for time, but as
days
we are so familiar with time, this is not diffi cult.
× 24
÷ 24
60 seconds (s) = 1 minute (min)
hours
60 minutes = 1 hour (h)
× 60
÷ 60
24 hours = 1 day
minutes
7 days = 1 week
× 60
÷ 60
seconds
In each of the measures of time shown, the conversions are straightforward. There are,
however, others which are not so precise. For example, there are 365 days in one year, except in
a leap year when there are 366. We also say that there are 52 weeks in a year. However, there are
actually 52 weeks and either 1 or 2 days. Finally, there are always 12 months in a year but the
number of days in each month varies.
WoRKEd ExaMPlE 4
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Complete the following.
Tutorial
3 min =
300 min =
4 days =
s
h
h
a
b
c
int-2300
1 day =
2 h =
min
s
d
e
Worked example 4
THINK
WRITE
3 min = 3 × 60 s
a
a
To change minutes to seconds: multiply
= 180 s
by 60.
300 min = 300 ÷ 60 h
b
b
To change minutes to hours: divide by 60.
= 5 h
4 days = 4 × 24 h
c
To change days to hours: multiply by 24.
c
= 96 h
1 day = 1 × 24 h
d
To change days to minutes: multiply by 24
d
= 24 × 60 min
(to change to hours) then multiply by 60 (to
= 1440 min
change to minutes).
2 hours = 2 × 60 min
e
To change hours to seconds: multiply by 60
e
= 120 × 60 s
(to change to minutes) then multiply by 60
= 7200 s
(to change to seconds).
When making a measurement it is important to fi rst determine the kind of quantity you are
measuring (length, mass, capacity or time) and then to choose the most practical unit. For
example, to measure the diameter of a coin you would use length and the most practical unit
would be millimetres.
WoRKEd ExaMPlE 5
Choose the most appropriate unit for each of the following measurements.
The thickness of a book
The amount of water in a glass
a
b
The amount of matter in a cricket ball
The length of a movie
c
d
THINK
WRITE
Millimetres is the most practical unit to use.
a
a
The thickness of a book is a measure of length.
49
Chapter 2
Units of measurement

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