7th grade Estimate how many: tag, catch again and compare worksheet

Estimate how many: tag, catch again and compare

Grade 7 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Bo marks 25 beans in a jar; a scoop of 60 has 5 marked. About how many have no tag?
2. 2.

   Esme stickers 80 snails in a garden (no snail minded); a later count of 50 snails finds 10 with stickers. About how many have no tag?
3. 3.

   Jun's two later catches give estimates of 200 and 250 butterflies. Which is the best single estimate?

   • About 225
   • About 450
   • Exactly 200
4. 4.

   Why might Luz do the second catch several times?

   • To make the numbers smaller
   • To tag each one of the butterflies
   • Averaging gives a steadier estimate
5. 5.

   Milo says the meadow has 30 butterflies because 30 were caught. Agree or disagree?

   • Agree: the catch is everyone
   • Agree: 30 is a round number
   • Disagree: 30 is only a sample
6. 6.

   Noah says the jar holds 48 beans because the scoop held 48. Agree or disagree?

   • Agree: 48 is close to 60
   • Agree: the scoop counts the whole jar
   • Disagree: scale up with the ratio
7. 7.

   Pia says the tag-and-catch method gives the exact number of turtles. Agree or disagree?

   • Disagree: it is an estimate
   • Agree: turtles stay put
   • Agree: proportions are exact
8. 8.

   Some of Ren's shell stickers fall off before the second count. What happens to the estimate?

   • It comes out too big
   • It comes out too small
   • It stays exact
9. 9.

   Tala's tagged butterflies stay near one bush and don't mix. What could go wrong?

   • The tags stop working
   • The catch's tagged share is off
   • Nothing changes
10. 10.

    Many new snails hatch between Zee's two counts. Why is that a problem?

    • Snails lose their stickers
    • The ratio gets exact
    • New ones change the mix