Math: Numbers and Operations Flashcards

What is √144?

Answer: 12

12 × 12 = 144, so √144 = 12.

A patient needs a dosage of 2.5 mg/kg. If the patient weighs 68 kg, how many milligrams should be given?

Answer: 170 mg

2.5 mg/kg × 68 kg = 170 mg.

Which fraction is largest: 3/5, 7/12, 5/8, or 2/3?

Answer: 2/3

Converting to decimals: 3/5=0.60, 7/12≈0.583, 5/8=0.625, 2/3≈0.667 — 2/3 is largest.

Subtract 3 2/5 from 5 1/4.

Answer: 1 17/20

5 1/4 − 3 2/5 = 21/4 − 17/5 = 105/20 − 68/20 = 37/20 = 1 17/20.

How many inches are in 4.5 feet?

Answer: 54

There are 12 inches per foot; 4.5 × 12 = 54 inches.

If a car travels 210 miles in 3.5 hours, what is its average speed in miles per hour?

Answer: 60 mph

Speed = distance ÷ time = 210 ÷ 3.5 = 60 mph.

What is 2³ × 3²?

Answer: 72

2³ = 8 and 3² = 9; 8 × 9 = 72.