OSAT Elementary Mathematics Concepts Flashcards

A number is divisible by both 2 and 3. Which of the following must also be a divisor of that number?

Answer: 6

If a number is divisible by both 2 and 3, it must be divisible by their LCM, which is 6.

On a coordinate plane, what are the coordinates of the origin?

Answer: (0, 0)

The origin is the point where the x-axis and y-axis intersect, located at (0, 0).

What is the mean (average) of the data set {8, 12, 10, 14, 6}?

Answer: 10

Mean = (8 + 12 + 10 + 14 + 6) ÷ 5 = 50 ÷ 5 = 10.

A triangle with all three sides of different lengths is called what?

Answer: Scalene

A scalene triangle has no equal sides, whereas equilateral has three equal and isosceles has two equal sides.

Which of the following is NOT a rational number?

Answer: √5

√5 is irrational because it cannot be expressed as a ratio of two integers; √4 = 2 is rational.

A train travels at 60 miles per hour. How far does it travel in 2.5 hours?

Answer: 150 miles

Distance = rate × time = 60 × 2.5 = 150 miles.

Which transformation slides a figure to a new position without rotating or flipping it?

Answer: Translation

A translation moves every point of a figure the same distance in the same direction without changing its orientation.