Percent Problems
What is 25% of 80?
20
If there are 3 red marbles and 5 blue marbles, what is the ratio of red to blue marbles?
3:5
How many sides does a hexagon have?
6 sides
8What is the value of the expression 3x if x = 4?
12
Sarah buys 3 pencils. Each pencil costs p dollars. If Sarah spends $3.00, what is the cost of one pencil?
Equation: 3p = 3
Answer: p = 1 (Each pencil costs $1)
What is 50% of 150?
75
Solve for x in the proportion 4/8 = x/16.
x = 8
What is the perimeter of a rectangle with a length of 10 cm and a width of 4 cm?
28 cm (Perimeter = 2 × (Length + Width))
Solve for x: 5x = 30
x = 6
Equation: 3p = 3
Answer: p = 1 (Each pencil costs $1)
Equation: 5b
Answer**: 5b (The total number of balls is 5 times the number of balls per box.)
If a shirt costs $40 and is on sale for 30% off, how much will the shirt cost after the discount?
$28
A recipe calls for 2 cups of flour for every 4 cups of sugar. What is the ratio of flour to sugar?
2:4 or 1:2
What is the area of a triangle with a base of 6 cm and a height of 9 cm?
27 cm² (Area = 1/2 × Base × Height)
Simplify the expression: 6 + 4 × 3
18 (Remember to follow the order of operations: PEMDAS)
Jacob has j dollars. He buys 2 books, each costing $7. If he has $20, what is the value of j?
Equation: j - 2(7) = 20
Answer: j = 34 (Jacob started with $34.)
A student answered 18 out of 24 questions correctly on a test. What percent of the questions did the student answer correctly?
75%
If a school has 300 students and 120 are boys, what is the ratio of boys to girls?
120:180, which simplifies to 2:3
Find the surface area of a rectangular prism with length 5 cm, width 3 cm, and height 4 cm.
94 cm² (Surface Area = 2lw + 2lh + 2wh; 2(5 × 3) + 2(5 × 4) + 2(3 × 4) = 30 + 40 + 24 = 94 cm²)
If 2x + 5 = 13, what is x?
x = 4
A gardener plants p flowers in each of 4 rows. If there are a total of 32 flowers, what is p?
Equation: 4p = 32
Answer: p = 8 (There are 8 flowers in each row.)
A car originally costs $20,000. It is now priced at 10% off. What is the sale price of the car?
$18,000
If a map uses a scale of 1 inch = 4 miles, how many miles does 5 inches represent?
20 miles
What is the volume of a rectangular prism with a length of 4 cm, width of 3 cm, and height of 5 cm?
60 cm³ (Volume = Length × Width × Height)
Simplify the expression:
3(2x + 4)
6x + 12
Emma has e dollars. She buys 3 packs of markers, and each pack costs $5. After her purchase, she has $10 left. How much money did she start with?
Equation: e - 3(5) = 10
Answer: e = 25 (Emma started with $25.)