Page 166 - SK Year 5 Mathematics DLP

Years and months

1 a Find the age difference, in years, between the

hamster and the rabbit.
1 1
10 years − 2 years = years
5 2

1 1
10 years − 2 years
5 2 1
1 × 2 1 × 5 hamster’s age: 2 years
2
= 10 years − 2 years
5 × 2 2 × 5
2 5
= 10 years − 2 years
10 10
12 5
= 9 years − 2 years
10 10
7
= 7 years
10
1 1 7 1
10 years − 2 years = 7 years rabbit’s age: 10 years
5
5 2 10
The age difference between the hamster and the rabbit
7
is 7 years.
10
b What is the age difference between the hamster and the goldfish?

1
My goldfish is about 8 years 8 months − 2 years
8 years 8 months old. 2
= years months

year month
1 1 6
2 year = ( × 12) months 8 8
2
1 − 2 6
= 6 months 6 2

1
Therefore, 2 years = 2 years 6 months.
2
1
8 years 8 months − 2 years = 6 years 2 months
2
The age difference between the hamster and the goldfish is 6 years 2 months.

State the above answer in months.

158 • Encourage pupils to use subtraction in vertical form involving
4.3.1 (iii)
unit conversion.