OAR OAR Math Skills: Arithmetic and Number Operations

Question 1

What is the value of 3/4 + 5/8?

Accepted Answer

11/8

Answer

Converting 3/4 to 6/8 and adding 5/8 gives 11/8.

Question 2

A sailor earns $2,400 per month. If 25% is withheld for taxes, what is the take-home pay?

Accepted Answer

$1,800

Answer

25% of $2,400 is $600, so take-home pay is $2,400 − $600 = $1,800.

Question 3

What is 0.045 expressed as a percentage?

Accepted Answer

4.5%

Answer

Multiplying 0.045 by 100 converts the decimal to 4.5%.

Question 4

Which of the following is the greatest common factor (GCF) of 48 and 36?

Accepted Answer

12

Answer

The factors of 48 and 36 share 12 as their largest common divisor.

Question 5

If a ship travels 240 nautical miles in 8 hours, what is its average speed in knots?

Accepted Answer

30 knots

Answer

Speed = distance ÷ time = 240 ÷ 8 = 30 knots.

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