Number Theory
This number set includes all positive counting numbers like 1, 2, 3…
What are natural numbers?
A $20 t-shirt is 25% off. What is the sale price?
What is $15?
The formula for the area of a circle is this.
What is A = πr²?
Solve: x + 5 = 12
What is x = 7?
The mean of 4, 6, 8
What is 6?
These are like natural numbers, but they also include zero.
What are whole numbers?
A $50 jacket is on sale for 30% off. How much is the discount?
What is $15?
The formula for the circumference of a circle is this.
What is C = 2πr or C = πd?
Solve: 3x - 3 = 18
What is x = 7?
The median of 7, 12, 15, 2, 9
What is 9?
This set includes negative numbers, zero, and positive whole numbers.
What are integers?
A bike originally costs $120 and is 40% off. What is the final price?
What is $72?
A circle has a radius of 5 cm. What is its area? (Use π ≈ 3.14)
What is 78.5 cm²?
Solve: 2x + 4 = 12
What is x = 4?
The mode of 2, 5, 2, 7, 8, 2
What is 2?
This type of number can be written as a fraction, like 3/4 or -5/2.
What are rational numbers?
A $200 tablet is discounted by 15%. What is the sale price?
What is $170?
A circle has a diameter of 10 m. What is its circumference? (Use π ≈ 3.14)
What is 31.4 m?
Solve: 5x - 3 = 22
What is x = 5?
The range of 15, 22, 9, 30, 18
What is 21?
Which set of numbers includes all integers and fractions?
What is the set of rational numbers?
You have a coupon for 10% off a $250 gaming console. Then you get an additional $20 off at checkout. What’s the final price?
What is $205?
A circular garden has a radius of 7 ft. What is the area of the garden? (Use π ≈ 3.14)
What is 153.86 ft²?
Solve: (x/3) + 2 = 8
What is x = 18?
Find the mean of 11, 14, 19, 22, and 34.
What is 20?