Book 5 science quiz: free printable worksheet

Fill in the missing number

Number bank: 1   3   4   4.5   12   23   24   165   365   1815   10,000   12,000

1. Each arm was about _______ meter long, and scientists think they could grip tightly.
   From: Tiny Arms, Huge Bite! Why Did T. Rex Have Tiny Arms?
2. Dinosaurs lived for about _______ million years. That is enough time for small changes in bodies to add up.
   From: So Many Dinos! Why Did So Many Kinds Exist?
3. In _______, the Tambora volcano in Indonesia threw up so much ash that the next summer was very cold around the world.
   From: Friend and Foe! Why Is Volcanic Ash Dangerous and Useful?
4. Scientists think Niagara Falls began about _______ years ago, at the end of the last ice age.
   From: Backward Bound! Why Do Waterfalls Move Backward?
5. Scientists think some of the oldest stone tools are about _______ million years old, from East Africa.
   From: Stone Age Toolkit! Why Did Early People Make Stone Tools?
6. Scientists have found villages that are more than _______ years old.
   From: Home Sweet Home! Why Did People Start Staying in One Place?
7. If you just say a leaf is big, a friend might picture something different. But if you say it's _______ centimeters, everyone knows.
   From: Measure Up! Why Measure Instead of Just Looking?
8. Earth takes about _______ days to go all the way around.
   From: Happy New Year! Why Do We Count Years?
9. Earth's spinning axis leans about _______ degrees, and it always leans the same way.
   From: Hot, Cold, Repeat! Why Do Seasons Change?
10. Earth has _______ main time zones, one for each hour of the spin.
    From: Time Travelers? Why Are There Time Zones?
11. Let one long line stand for all of Earth's story, about _______ billion years.
    From: A Tiny Slice! Why Is Your Life a Small Part of Earth Time?
12. The rule is a bit more careful than just every _______ years.
    From: Bonus Day! Why Do Some Years Get an Extra Day?