OSAT OSAT Elementary Mathematics Concepts 5

Question 1

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

Accepted Answer

6

Answer

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

Question 2

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

Accepted Answer

(0, 0)

Answer

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

Question 3

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

Accepted Answer

10

Answer

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

Question 4

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

Accepted Answer

Scalene

Answer

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

Question 5

Which of the following is NOT a rational number?

Accepted Answer

√5

Answer

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

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