When writing an amount as a fraction of the total make sure both are in the same units
first.
Examples
Write each amount as a fraction of the total amount in simplest form.
(a)
12 cm out of 28 cm
same units
12
28
=
=
(b)
20 seconds out of 2 minutes
12÷4
28÷4
3
7
different units
2 minutes = 2 x 60 = 120 seconds
20
120
=
=
20÷20
120÷20
1
6
Exercise 1C p17 Q14aceg, 17, 19, 20, 22