Estimate and Count to 100
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Estimate and Count to 100
Estimate and count to 100 for Grade 2: two collections of 50 to 100 shapes, with a group of 10 to compare. Estimate first, then count in groups of 10. The answer key gives each count.
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Teach it first
Estimate, Then CountA teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.- Pages
- 1
- Last updated
- Time
- About 15 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Look at a collection of up to 200 objects, make a sensible estimate of how many there are, then count, by ones or in groups of 10, to check the estimate.
Reviewed by Ms. Olivia Parker, Teacher. How we check worksheets
How to use this sheet
- Cover the counting part of the sheet and ask for the estimate first. An estimate made after counting is not an estimate.
- Before estimating, have the child find a group of about ten on the page and use it to judge the rest.
- After counting, talk about how close the estimate was. Close is the goal, not exact.
Common mistakes
- Counting one by one and calling the answer an estimate. Give only a few seconds to look before writing a guess.
- Rubbing out an estimate after counting so it matches. Explain that a guess that was a bit off is still a good estimate.
- Guessing numbers that are far too big or too small, such as 1,000 for a jar of 40. Compare with a group of 10 first.
