Math Flashcards
7 cards from real CBEST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Math flashcards as text
A number is increased by 40% to get 84. What was the original number?
Answer: 60
Let the original number be n; 1.4n = 84, so n = 84 ÷ 1.4 = 60.
What is the perimeter of a square with a side length of 9 meters?
Answer: 36 m
Perimeter of a square = 4 × side = 4 × 9 = 36 m.
Order from least to greatest: 0.45, 2/5, 47%, 0.4
Answer: 0.4, 2/5, 0.45, 47%
Converting all to decimals: 0.4, 0.4, 0.45, 0.47; so the order is 0.4 = 2/5 < 0.45 < 47%.
A train travels 180 miles in 2.5 hours. What is the train's average speed in miles per hour?
Answer: 72 mph
Speed = distance ÷ time = 180 ÷ 2.5 = 72 mph.
If a shirt originally costs $45 and is on sale for 20% off, what is the sale price?
Answer: $36
20% of $45 = $9; $45 − $9 = $36.
The mean of five numbers is 14. Four of the numbers are 10, 12, 16, and 18. What is the fifth number?
Answer: 14
Total sum = 14 × 5 = 70; 70 − (10 + 12 + 16 + 18) = 70 − 56 = 14.
Which expression is equivalent to 5(2x + 3)?
Answer: 10x + 15
Distribute 5: 5 × 2x = 10x and 5 × 3 = 15, giving 10x + 15.