Get Them Into the Ball Park! Using Estimation As A Means To Help Students Determine Reasonableness. Melissa Hedges, Math Teaching Specialist, firstname.lastname@example.org Beth Schefelker, Mathematics Teaching Specialist, email@example.com. www.mmp.uwm.edu. Session Goals.
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Get Them Into the Ball Park!Using Estimation As A Means To Help Students Determine Reasonableness
Melissa Hedges, Math Teaching Specialist,
Beth Schefelker, Mathematics Teaching Specialist, firstname.lastname@example.org
The Milwaukee Mathematics Partnership (MMP) is supported with funding from the National Science Foundation.
139 x 43
Make an estimate. Keep track of how you got your estimate.
Share your strategy.
Note the mathematical understandings you needed to make this estimate?
139 x 43
What if the estimate was 6000?
Where did this estimate come from?
Was it a good approach?
How should it be adjusted?
Why might someone select 150 instead of 140?
Estimation requires good mental arithmetic skills which come from an understanding of the nature of the operations, a firm understanding of place value, and the ability to use various properties.
Bassarear, T. Mathematics for Elementary School Teachers. 2nd Edition. Houghton Mifflin Company.
5,210 + 298 ≈ 5,400 5,500 7,000 8,000
59 x 11≈60 500600 6,000
268 ÷ 9.9 ≈25 250 2.5 2,500
87 x 52
3,482 ÷ 7
0.1 1 10 100 1000
Solve 259 ÷ 24
Adding It Up, 2001
____ ____ x ____