Money Matters
You bought a notebook for $4.50 and paid with a $10 bill. What percent of your money did you spend?
45%
Write 1/2 as a decimal and percent.
1/2 = 0.5 = 50%
Convert 0.6 to a fraction and a percent.
0.6 = 3/5 = 60%
Solve: x + 5 = 12. What is x?
x = 7
Solve: x + 6 < 12. What values could x be? Give at least two examples.
x < 6; x = 5, 4, 3, 2, 1, 0
You have saved 3/4 of your $40 allowance. How much money have you saved?
$30
Write 0.75 as a fraction and percent.
0.75 = 3/4 = 75%
You scored 18 out of 20 on a quiz. Write your score as a decimal and a percent.
18/20 = 0.9 = 90%
Solve: x − 9 = 23. What is x?
x = 32
Solve and graph on a number line: x − 4 > 5
x > 9; Graph: open circle at 9, arrow to the right.
A $25 shirt is on sale for 20% off. How much will you pay before tax?
$20
A store has a "30% off" sale. What is 30% as a decimal and as a simplified fraction?
30% = 0.3 = 3/10
Convert 125% to a decimal and a fraction. Simplify the fraction.
125% = 1.25 = 5/4
Solve: 7x = 35. What is x?
x = 5
A triangle’s perimeter is 30. Each side is the same length. Write and solve the equation.
Equation: 3x = 30; Solve: x = 10 units long
A pair of shoes costs $54. If the tax is 8.25%, what is the total cost? Round to the nearest cent.
$58.46
A classroom is 2/5 boys. Write this as a decimal and percent.
2/5 = 0.4 = 40%
Which is bigger: 0.85 or 85%? Explain your reasoning.
Trick question — they're equal: 85% = 0.85. So: Equal!
Solve: x/4 = 8. What is x?
x = 32
The area of a square is 64 cm^2. Write and solve an equation to find the side length.
Equation: s^2 = 64; Solve: x = 8 cm
You earn $12 an hour walking dogs. If you worked 15 hours, what fraction of $200 did you earn? Simplify your answer.
9/10
A pizza was cut into 8 slices. You ate 3 slices. Write this as a decimal and percent.
3/8 = 0.375 = 37.5%
A bank gives 2.5% interest. Write this as a decimal and a simplified fraction.
2.5% = 0.025 = 1/40
Write an equation: "Five times a number is 45." Then solve for the number.
Equation: 5x = 45; Solution: x = 9
You must be at least 48 inches tall to ride a roller coaster. Write an inequality to show the possible heights h.
h >= 48