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Slide 1: Diapositive
MathematicsLower Secondary (Key Stage 3)

Cette leçon contient 24 diapositives, avec quiz interactifs et diapositives de texte.

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Essential skills
Level 1 revision

Slide 1 - Diapositive

Fractions
Introduction

Fractions are parts out of a whole. The whole or total amount is always the
bottom of the fraction. The part you are interested in is the top of the fraction.
The line represents a division.

Slide 2 - Diapositive

To find fraction parts
÷ by the bottom of the fraction × by the top of the fraction 
Did you know 
You can multiply 
by the to first 
and then divide by the
bottom and still get
the same answer

Slide 3 - Diapositive

Simplifying Fractions  This means writing the fraction in its lowest terms. To do this you need to divide
both top and bottom of the fraction by the same number to make them smaller. 

Slide 4 - Diapositive

1/2 is the same as...
A
50%
B
20%
C
2%
D
5%

Slide 5 - Quiz

To find 1/4 of an amount....
A
divide by 2
B
divide by 4
C
divide by .5
D
divide by .4

Slide 6 - Quiz

What is 1/4 of 5600?
A
1400
B
2800
C
1600
D
1800

Slide 7 - Quiz

Look out for the words of and off
You may be asked to take a fraction off an amount.
There is 1/4 off the price of a DVD that costs £20. What does it cost now?
First find 1/4 as we did above but then take the 1/4 off using subtraction.
20 ÷ 4 = 5     5 × 1 = 5 This is 1/4 but we need to take this off the original price.20 – 5 = 15 so the new price is £15.
You may also need to use this technique if you see words such as
reduced by, discount, saving

Slide 8 - Diapositive

10 out of 30 students were under 18. Express this amount as a fraction in its simplest form
A
10/30
B
1/3
C
18/30
D
3/10

Slide 9 - Quiz

If a third (1/3) of students were under 18, what fraction were over 18?
A
1/3
B
2/3
C
18/30
D
3/3

Slide 10 - Quiz

40 out of 120 students are vegetarian. Express this as a fraction in its simplest form.
A
4/12
B
40/120
C
2/6
D
1/3

Slide 11 - Quiz

2 out of 14 students are vegetarian. What is the likelihood/probability of a student being vegetarian?
A
impossible
B
likely
C
unlikely
D
even chance

Slide 12 - Quiz

What is range?
A
Total divided by number of items.
B
Highest take away lowest.
C
A shop in Ballymena
D
a list of items

Slide 13 - Quiz

What calculation is needed for volume?
A
l + w + h
B
l x w x h
C
2l+2b
D
hx4

Slide 14 - Quiz

The volume of a cuboid measuring 30cm by 20cm by 15cm is...
A
9000cm
B
9000cm3
C
65cm3
D
65cm

Slide 15 - Quiz

Write 13:35 in the 12-hour clock.
A
1.35
B
1.35pm
C
half 1
D
20 to 2

Slide 16 - Quiz

Write 4.55pm in the 24-hour clock.
A
16:55
B
14:55
C
5 - 2 -5
D
5 past 4

Slide 17 - Quiz

Write 2.05pm in the 24-hour clock.
A
02:05
B
14:05
C
20;05
D
14:5

Slide 18 - Quiz

Mean is...
A
Total divided by number of items
B
Highest take away lowest
C
middle number
D
being cross

Slide 19 - Quiz

Check this calculation:
8/25= 0.32
A
0.32 x 25 = 8
B
8/.32 = 25
C
.32 x 8 = 25
D
32/.8 =25

Slide 20 - Quiz

If you have a total and need to work out one/per or each of something, what calculation is needed?
A
add
B
subtract
C
multiply
D
divide

Slide 21 - Quiz

Which is heavier?
A
3.3kg
B
3.251kg
C
.3333kg
D
33333g

Slide 22 - Quiz

Which is greater?
A
8.9
B
8.891
C
.98
D
9

Slide 23 - Quiz

What is 3500g in kg?
A
35kg
B
3.5kg
C
350kg
D
.35kg

Slide 24 - Quiz