Ratios & Proportional Relationships
What is a ratio?
A comparison of two quantities
Simplify: 3x+2x
5x
What is the formula for the area of a rectangle?
Length × Width
What is the mean of these numbers: 2, 4, 6?
4
What is the opposite of -8?
8
Write a ratio for 3 red marbles to 5 blue marbles.
3:5 or 3 to 5
Solve: X+7=13
X=6
What is the formula for the area of a triangle?
1/2xBaseXHeight
What is the median of: 1, 3, 7, 9, 10?
7
Plot -3 and 4 on a number line. Which is farther from zero?
They are the same distance (3 and 4 units respectively)
What does it mean for two ratios to be equivalent?
They have the same value when simplified
What’s the difference between an expression and an equation?
Expression has no equals sign; equation does
What is the circumference formula for a circle?
C=2πr
What is the mode of: 5, 6, 6, 7, 8?
6
What is the sum: −7+3
-4
What is a unit rate?
A ratio with a denominator of 1 (e.g., 60 miles per hour)
Solve: 2x−4=10
X=7
What is the volume of a rectangular prism with length 3, width 2, and height 5?
30 cubic units
What is the probability of flipping heads on a coin?
1 out of 2, or ½
Multiply: −2×−6
12
A recipe uses 4 cups of flour for every 5 cups of sugar. How much flour is needed for 15 cups of sugar?
12 cups of flour
What does it mean to evaluate an expression?
Plug in a value for the variable and simplify
Name all the types of angles based on size.
Acute, right, obtuse, straight
If a bag has 3 red, 5 green, and 2 blue marbles, what’s the probability of picking a green one?
5 out of 10, or ½
Divide: −12÷3
-4