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Book 2 science quiz: free printable worksheet

A free 12-question number quiz for kids, parents and teachers, based on A Million Whys Book 2, The Inside Expedition. Every fact comes straight from a page in the book. Fill in each missing number from the number bank. The answer key links to the video for each question.

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Name: ______________________    Date: ______________    Score: ____ / 12

Fill in the missing number

Number bank: 1   2   4   10   20   21   24   29   30   365   5,000   7,000

  1. The brain is about _______ percent of your weight.
    From: Why Does the Brain Use So Much Energy?
  2. In this pie, the small green slice is about _______ percent, the share of people who are left-handed.
    From: Why Are Some People Left-Handed?
  3. Most kids lose about _______ baby teeth.
    From: Why Do We Lose Baby Teeth?
  4. Hair on your head grows about _______ centimeter a month.
    From: Why Do Hair and Nails Keep Growing?
  5. About _______ languages are spoken around the world.
    From: Why Do People Speak Different Languages?
  6. Earth travels around the sun at about _______ kilometers every second.
    From: Why Do We Celebrate Birthdays?
  7. People invented writing more than _______ years ago, pressing marks into soft clay.
    From: Why Do We Write?
  8. One full spin of Earth takes about _______ hours.
    From: Why Do We Have Day and Night?
  9. Earth travels in a big circle around the sun, and one trip takes about _______ days.
    From: Why Do We Have Seasons?
  10. Earth's bulge at the equator is only about _______ kilometers, tiny compared with the whole planet.
    From: Why Is Earth Round?
  11. The moon goes through its cycle of phases in about _______ days.
    From: Why Does the Moon Change Shape?
  12. The closest star after our sun is more than _______ light-years away.
    From: Why Do Stars Look So Small?
Show the answer key
  1. 2 (The brain is about 2 percent of your weight. Book 2, Question 10)
  2. 10 (In this pie, the small green slice is about 10 percent, the share of people who are left-handed. Book 2, Question 15)
  3. 20 (Most kids lose about 20 baby teeth. Book 2, Question 77)
  4. 1 (Hair on your head grows about 1 centimeter a month. Book 2, Question 93)
  5. 7,000 (About 7,000 languages are spoken around the world. Book 2, Question 103)
  6. 30 (Earth travels around the sun at about 30 kilometers every second. Book 2, Question 109)
  7. 5,000 (People invented writing more than 5,000 years ago, pressing marks into soft clay. Book 2, Question 116)
  8. 24 (One full spin of Earth takes about 24 hours. Book 2, Question 126)
  9. 365 (Earth travels in a big circle around the sun, and one trip takes about 365 days. Book 2, Question 127)
  10. 21 (Earth's bulge at the equator is only about 21 kilometers, tiny compared with the whole planet. Book 2, Question 135)
  11. 29 (The moon goes through its cycle of phases in about 29 days. Book 2, Question 137)
  12. 4 (The closest star after our sun is more than 4 light-years away. Book 2, Question 138)

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