MCAS MCAS Mathematics 3 — Questions and Answers
Question 1: Which number is irrational?
- √25
- √36
- √2 (Correct answer)
- 0.75
Correct answer: √2
√2 is irrational because it cannot be expressed as a fraction and its decimal never repeats or terminates.
Question 2: What is the least common multiple (LCM) of 4 and 6?
- 10
- 12 (Correct answer)
- 16
- 24
Correct answer: 12
The LCM of 4 and 6 is 12 because 12 is the smallest number divisible by both 4 and 6.
Question 3: If y = 2x − 1, what is y when x = 4?
- 5
- 6
- 7 (Correct answer)
- 8
Correct answer: 7
Substituting x = 4: y = 2(4) − 1 = 8 − 1 = 7.
Question 4: A store sells apples for $0.75 each. How much do 8 apples cost?
- $5.00
- $5.50
- $6.00 (Correct answer)
- $6.50
Correct answer: $6.00
8 × $0.75 = $6.00.
Question 5: What type of angle measures exactly 90°?
- Acute
- Obtuse
- Straight
- Right (Correct answer)
Correct answer: Right
A right angle measures exactly 90° and is often marked with a small square symbol.
Question 6: Simplify the fraction 18/24.
- 2/3
- 3/4 (Correct answer)
- 4/6
- 6/8
Correct answer: 3/4
The GCF of 18 and 24 is 6; dividing both by 6 gives 3/4.
MCAS MCAS Mathematics 3
Which number is irrational?