Simple Interest
Decimals and percentages
Best Buys
Converting months and years
Mystery
100
What does the P stand for in the simple interest formula?
Principal
100
How do you convert a percentage to a decimal?
divide by 100 or move the decimal point 2 places to the right.
100
Which is the better option:
3 batteries for $4.80 OR 12 batteries for $14.76
12 batteries for $14.76
100
How many months are there in 2 years?
24
100
Solve: 5 + 2 x 10
25
200
What is the simple interest formula?
I=Prn
200
What is 25% as a decimal?
0.25
200
Which is the better buy:
12 chocolate bars for $22 OR 20 chocolate bars for $33
20 chocolate bars for $33
200
How many months are there in 5 years?
60
200
Solve: 3 x 2 + 2 x 2
10
300
Calculate the simple interest when $7000 is invested at 6% per annum for 2 years.
$840
300
What is 33.5% as a decimal?
0.335
300
You go to buy a PS3 - which is the better option:
Deal 1 - Original price $150 reduced by 15%
Deal 2 - Original Price $200 reduced by 30%
Deal 1
300
How many years in 48 months?
4
300
You are in a cabin and it is pitch black. You have one match on you. Which do you light first, the newspaper, the lamp, the candle, or the fire?
The match
400
Calculate the simple interest when $600 is invested at 8% per annum for 18 months.
$72
400
What is 67.25% as a decimal?
0.6725
400
You want to buy a hair straightener. Which is the better deal?
Deal 1: Original price $80 reduced by 25%
Deal 2: Original price $110 reduced by 70%
Deal 2
400
How many months in 6.25 years?
75 months
400
How many triangles are there in total?
18
500
$5000 is borrowed at 11% per annum simple interest for three years. What is the total amount owed over the 3 years?
$6650
500
What is 125.5% as a decimal?
1.255
500
Which is the better deal and by how much?
Deal 1: 7 muesli bars for $4.90
Deal 2: 5 muesli bars for $3.45
Deal 2 by 1 cent a muesli bar
500
How many years in 87 months?
7.25
500
What is the number of the parking spot occupied by the car?
87
(numbers are upside down)