1. HW: Ex 4a 1,6,8,13,15,17 and 18
15 minutes, 45 minutes
15 45
6) 20 minutes, 2 hours
2 hours = 60 x 2 = 120 minutes
20 120
= 1 3
= 1 6

2. HW: Ex 4a 1,6,8,13,15,17 and 18
8) 25 cm2, 400 cm2
25 400
13) 800g, 2.25 kg
2.25 x 1000 = 2 250
= 1 16
= 16 45
Division by 5

3. HW: Ex 4a 1,6,8,13,15,17 and 18
15) Sally’s journey to school costs 55cent on one bus and 35cent on another bus
Find the total cost of her journey
= 90 cent
b) What fraction of the total cost arises from each bus
Division by 5
= 11 18
= 7 18
55 90
35 90

4. HW: Ex 4a 1,6,8,13,15,17 and 18
17) Simon gets €2.40 a week pocket money. If he spends €1.35, what fraction of his pocket money is left? 2.40 – 1.35 = €1.05 left
Division by 15
= 7 16

5. HW: Ex 4a 1,6,8,13,15,17 and 18
18) When she left home, Carol’s school bag weighed 𝟑 𝟏 𝟒 𝒌𝒈. When she got to school, she took out her maths text book. Her school bag then weighed 𝟐 𝟏 𝟐 𝒌𝒈. What was the weight of her maths book as a fraction of her bag when she left home?
𝟑 𝟏 𝟒 − 𝟐 𝟏 𝟐 =
𝟑 𝟒 ÷𝟑 𝟏 𝟒
13 4
− 5 2
= 13 4
− 10 4
= 3 4 𝑘𝑔
= 3 4 ÷ 13 4
= 3 13

6. the FRACTION OF A QUANTITY
L.O. To be able to find
the FRACTION OF A QUANTITY

7. 3 55 of 5 ‘Whole number ÷ denominator x numerator’
Always use this formula for finding fractions of whole numbers:
‘Whole number ÷ denominator x numerator’
Numerator 3 5 55 of
Denominator
Whole number

8. Let’s try one... 3 5 of 5 ÷ 33 = x
Denominator
Numerator
Whole number

9. Another one... 4 5 6 of 7 ÷ 32 = x
Denominator
Numerator
Whole number

10. ÷ = 6 8 1 of 9 54 x Follow the formula and it’s easy... Denominator
Numerator
Whole number

11. Important Note
When you are finding a fraction of a whole quantity you are finding a part of that quantity, so:
The UNITS of your answer will be the SAME as the units of the whole quantity
Your answer will ALWAYS be SMALLER than the whole quantity, because it is part of it!

12. Top Trumps Activity 3 Players
One player mentions an attribute and all of the others must work out the fraction of the quantity to find the value of that attribute
The person who has the largest quantity for that attribute, takes the other cards.
Whoever wins the cards, will then pick the next attribute
Players who end up without cards are out of the game
The winner is the last one standing
Dizzee Rascal, The Saturdays

13. Fraction of a Quantity HW
STP 8 Pg 68 Exercise 4b 17-19
20 is a challenge – optional question