IMO Arithmetic and Operations 2

Question 1

What is the result of 5/8 + 3/8?

Accepted Answer

1

Answer

5/8 + 3/8 = 8/8 = 1.

Question 2

Which of the following is the greatest: 3/4, 5/8, 7/10, or 2/3?

Accepted Answer

3/4

Answer

Converting to decimals: 3/4 = 0.75, 5/8 = 0.625, 7/10 = 0.70, 2/3 ≈ 0.667; so 3/4 is greatest.

Question 3

What is 2.5 × 4.2?

Accepted Answer

10.5

Answer

2.5 × 4.2 = 10.5.

Question 4

A student scored 72 out of 90. What percentage did they score?

Accepted Answer

80%

Answer

Percentage = (72/90) × 100 = 80%.

Question 5

What is the value of 7! (7 factorial)?

Accepted Answer

5040

Answer

7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040.

IMO - International Mathematics Olympiad Practice Test