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Mathematical Quantification of Natural Phenomena

Addition & Subtraction

A collection of arithmetic problems based on measurements in physics, biology, astronomy, and chemistry.

science mathematics facts

12 Questions Medium Ages 10+ Apr 10, 2026

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About this Study Set

This study set covers Addition & Subtraction through 12 practice questions. A collection of arithmetic problems based on measurements in physics, biology, astronomy, and chemistry. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 12 questions from the Mathematical Quantification of Natural Phenomena study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 A standard water molecule (H2O) contains 2 hydrogen atoms and 1 oxygen atom. If you combine 7 water molecules, how many total hydrogen atoms are present?

A 9
B 14
C 21
D 5

2 The Earth has 1 natural satellite (the Moon) and Mars has 2 moons (Phobos and Deimos). What is the total sum of moons for these two planets?

3 A human adult typically has 32 permanent teeth. If a person loses 4 wisdom teeth, how many permanent teeth remain?

A 28
B 30
C 26
D 24

4 The planet Neptune has 14 confirmed moons. If 6 of these are categorized as inner moons, how many are not categorized as inner moons?

A 20
B 7
C 8
D 9

5 Visible light consists of 7 primary colours (Red, Orange, Yellow, Green, Blue, Indigo, Violet). If you subtract the cool colours (Blue, Indigo, Violet) from the total, how many colours remain?

6 Standard atmospheric pressure at sea level is 1013 millibars. If a low-pressure system decreases this value by 25 millibars, what is the new pressure?

A 988
B 1038
C 998
D 1008

7 A gold atom has 79 protons. If an atom of mercury has 80 protons, what is the difference in the number of protons between them?

A 2
B 1
C 159
D 0

8 The freezing point of water is 0 degrees Celsius and the boiling point is 100 degrees Celsius. What is the difference between these two points?

A 50
B 100
C 150
D 90

9 A standard deck of cards excluding Jokers has 52 cards. If you remove the 13 Hearts, how many cards remain?

A 39
B 40
C 26
D 33

10 The inner planets of our solar system are Mercury, Venus, Earth, and Mars. The outer planets are Jupiter, Saturn, Uranus, and Neptune. What is the total count of these planets?

11 A sound wave travels at approximately 343 meters per second in air. If a pulse travels for 2 seconds, what is the total distance covered?

A 345m
B 686m
C 341m
D 1029m

12 In the human body, the rib cage consists of 24 individual ribs. If 4 are classified as 'floating ribs', how many are not floating ribs?

A 20
B 28
C 12
D 18

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