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Percentages 3 - Compound
Percentages 4 - Compound Interest
How do we calculate the interest on money in our bank?
5 questions - Are you ready?
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Mathematics
Upper Secondary (Key Stage 4)
GCSE
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Percentages 4 - Compound Interest
How do we calculate the interest on money in our bank?
5 questions - Are you ready?
Slide 1 - Diapositive
What is 20% of 150?
A
25
B
50
C
40
D
30
Slide 2 - Quiz
Find 30% of 200.
A
50
B
70
C
40
D
60
Slide 3 - Quiz
Calculate 15% of 80.
A
12
B
10
C
20
D
25
Slide 4 - Quiz
What percentage of 120 is 24?
A
30
B
15
C
20
D
25
Slide 5 - Quiz
If 40% of a number is 80, what is the number?
A
150
B
200
C
250
D
100
Slide 6 - Quiz
Percentage Multipliers
If I want 30% of £52:
0.3 x 52
If I want 79% of £385
0.79 x 385
Slide 7 - Diapositive
Percentage Multipliers
If I want
30% increase
on £52:
100% +30% of 52
1.3 x 52
If I want
79% decrease
on £385
100%-79% of 385
0.21 x 385
Slide 8 - Diapositive
What is the multiplier for a 75% increase?
A
1.25
B
2.0
C
0.75
D
1.75
Slide 9 - Quiz
What is the multiplier for a 15% decrease?
A
0.15
B
1.15
C
0.85
D
0.85
Slide 10 - Quiz
What is the multiplier for a 50% increase?
A
2.50
B
1.50
C
1.0
D
0.50
Slide 11 - Quiz
What is the multiplier for a 10% decrease?
A
0.90
B
1.10
C
0.10
D
0.20
Slide 12 - Quiz
What is the multiplier for a 25% increase?
A
2.0
B
1.25
C
0.25
D
1.5
Slide 13 - Quiz
If I want 20% Increase on $40, what is my calculation?
Slide 14 - Question ouverte
If I want 17% Increase on £75, what is my calculation?
Slide 15 - Question ouverte
If I want 7% Increase on £260, what is my calculation?
Slide 16 - Question ouverte
If I want 7% Decrease on $85, what is my calculation?
Slide 17 - Question ouverte
If I want 24% Decrease on £490, what is my calculation?
Slide 18 - Question ouverte
www.mathsbox.org.uk
Slide 19 - Lien
Slide 20 - Diapositive
Compound Interest
If Lili puts £1500 in a savings account with 3% interest per annum and leaves it for 5 years, how much will be in the account at the end?
Slide 21 - Diapositive
Compound Interest
If Daisy puts £3200 in a savings account with 2% interest per annum and leaves it for 3 years, how much will be in the account at the end?
Slide 22 - Diapositive
Slide 23 - Diapositive
If £1000 is invested at 5% annual interest, how much would be in the account after 3 years with compound interest?
A
£1157.63
B
£1200.00
C
£1150.00
D
£1100.00
Slide 24 - Quiz
What is the amount in the account after 4 years if £2000 is invested at 8% compound interest annually?
A
£2500.00
B
£2677.12
C
£2700.00
D
£2600.00
Slide 25 - Quiz
If £1500 is invested at 6% annual interest, how much would be in the account after 5 years with compound interest?
A
£1900.00
B
£2100.00
C
£2000.00
D
£2011.58
Slide 26 - Quiz
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Slide 27 - Sondage
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