Math Formulas Everyone Should Know — today's round

Question 1

You see lightning and count 5 seconds before the thunder. How far away is the storm?

Accepted Answer

About 1 mile

Answer

About 300 feet

Answer

About 5 miles

Answer

About 10 miles

Question 2

A 5-foot crowbar rests on a brick 4 inches from a rock. You push the far end down with 25 pounds. How much force lifts the rock?

Accepted Answer

350 pounds

Answer

25 pounds

Answer

175 pounds

Answer

3,500 pounds

Question 3

Your car gets 30 miles per gallon. Gas costs $3.50 a gallon. What does a 300-mile trip cost?

Accepted Answer

About $35

Answer

About $20

Answer

About $60

Answer

About $105

Question 4

A 55-inch TV is measured across the diagonal, and the screen is 16 by 9. How wide is it?

Accepted Answer

About 48 inches

Answer

About 40 inches

Answer

About 55 inches

Answer

About 62 inches

Question 5

A 1,500-watt heater runs for 5 hours. Electricity costs 20 cents per kilowatt-hour. What is the bill?

Accepted Answer

$1.50

Answer

20 cents

Answer

75 cents

Answer

$7.50

Question 6

A glass holds 12 ounces of water. Roughly how many water molecules is that?

Accepted Answer

10 to the 25th

Answer

10 to the 11th

Answer

10 to the 16th

Answer

10 to the 31st

Question 7

A balloon holds one cubic foot of helium. Roughly how much weight can it lift?

Accepted Answer

About 1 ounce

Answer

About a tenth of an ounce

Answer

About 1 pound

Answer

About 10 pounds

Question 8

A magnitude 7 earthquake against a magnitude 5. How much bigger is the shaking?

Accepted Answer

100 times

Answer

2 times

Answer

20 times

Answer

1,000 times

Question 9

You stand on a beach with your eyes 6 feet above the water. How far away is the horizon?

Accepted Answer

About 3 miles

Answer

About 12 miles

Answer

About 30 miles

Answer

About 60 miles

Question 10

You drive to a town at 30 mph and drive back at 60 mph. What is your average speed for the whole trip?

Accepted Answer

40 mph

Answer

45 mph

Answer

50 mph

Answer

30 mph