Astronomy
A spacecraft travels toward the Moon at a speed of 7,700 km per hour. The average distance from Earth to the Moon is about 384,400 km. Using the formula time = distance ÷ speed, the trip would take about this many hours.
50 hours
Water is made of 2 hydrogen atoms and 1 oxygen atom. This chemical formula represents water.
H₂O
The human body has about 206 bones. If someone breaks 2 bones, this is how many bones remain unbroken.
204
A simple lever helps lift heavy objects. If a lever lets you lift a 40-kilogram rock using only 10 kilograms of force, the lever is multiplying your force by this number.
4
A computer program repeats a command 5 times inside a loop, and each time it prints 2 numbers. This is the total number of numbers printed.
10
Earth is about 150 million kilometers from the Sun. If light travels 300,000 kilometers per second, What number of minutes is closest to the time it takes.
8 minutes
A water molecule has 2 hydrogen atoms and 1 oxygen atom. If a scientist has 6 water molecules, this is the total number of hydrogen atoms present.
12
human normally has 32 adult teeth. If a dentist removes 4 wisdom teeth and replaces one with a gold tooth, this is how many teeth remain.
29 teeth
An engineer designs a bridge using 8 identical support beams, each able to hold 1,500 kilograms. If the load is spread evenly across the beams, this is the maximum total weight the bridge supports can hold.
12,000 kilograms
A computer stores numbers using binary, which uses only 2 digits: 0 and 1. With 3 binary digits (bits), this is the total number of different numbers that can be represented
8
Earth takes 365 days to orbit the Sun. Jupiter takes about 12 Earth years to complete one orbit. This is approximately how many Earth days for one Jupiter year.
4,380 days
Water has the formula H₂O. Hydrogen has an atomic mass of 1, and oxygen has an atomic mass of 16. Using these values, this is the total atomic mass of one water molecule.
18
The human body contains about 5 liters of blood. If the heart pumps about 70 milliliters per beat, this is approximately how many heartbeats it would take to pump a volume equal to all the blood in the body once.
71 beats
A gear system has a small gear with 12 teeth connected to a large gear with 36 teeth. When the small gear makes 3 full rotations, this is how many full rotations the large gear makes.
1 rotation
A programmer writes a loop that runs 8 times. Inside the loop, the program prints 3 lines of text each time. This is the total number of lines printed when the program finishes
24 lines
A planet orbits its star once every 8 Earth years. If astronomers observe the planet complete 3 full orbits, they would need to wait about this many Earth years.
24 years
Glucose has the chemical formula C₆H₁₂O₆. Using atomic masses C = 12, H = 1, and O = 16, this is the total atomic mass of one glucose molecule.
180
Human cells contain 46 chromosomes, arranged in 23 pairs. If a skin cell divides to form 2 identical cells, this is the total number of chromosomes in both new cells combined.
92 chromosomes
An engineer designs a rectangular solar panel array that is 12 meters long and 8 meters wide. Each square meter of panel can produce 200 watts of power in full sunlight. This is the total power output of the array.
19,200 watts
A program starts with the number 3. Each time a loop runs, the program doubles the number. If the loop runs 5 times, this is the final number
96
A light-year is the distance light travels in one year. Light travels about 300,000 km per second. If there are about 31,500,000 seconds in a year, light travels about this many trillion kilometers in one year.
9.5 trillion kilometers
Carbon dioxide has the formula CO₂. Using atomic masses C = 12 and O = 16, oxygen makes up about this percent of the total mass of a carbon dioxide molecule.
73%
The human heart beats about 70 times per minute. At that rate, this is approximately how many times the heart beats in one day
100,800 beats
A water tank shaped like a rectangular prism is 4 meters long, 3 meters wide, and 2 meters tall. Since 1 cubic meter = 1,000 liters, this tank can hold this many liters of water when full.
24,000 liters
A computer stores numbers using binary. The binary number 1011 represents this decimal (base-10) number.
11