Unit 3 Lesson 2: We can estimate products to help us solve problems efficiently!
Important Vocabulary:
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Factor
Product
Associative
Commutative
Decompose
Estimate:
Outside Resources: https://www.khanacademy.org/math/arithmetic/multiplicationdivision/multi_digit_multiplication/v/multiplying-whole-numbers-and-applications-4
Go Math/Engage NY Lesson #:
Strong Mathematicians can estimate to solve multiplication problems quickly. They can
also use their estimates to help them check their work!
Example:
Jill purchased 32 picture frames that cost $17.89 each. About how much did she spend?
1. First estimate:
32 30
$17.89 20
2. Next multiply
30 x 20=
(3x2) x (10x10)=
6 x 100= $600
Jill spent $600.00 on the picture frames