Standard Algorithm
Higher-Order Thinking
Fix the Problem
Estimating Products
100

24 x 8

192

100

___________ is the answer to a multiplication problem.

A product

100

156 x 34

Multiplied wrong 

100

543 x 2

~ 1,000

200

387 x 7

2,709

200

Jerry weighs 105 pounds. If a male brown bear weighs 11 times as much, what is the brown bear's weight? 

1,155 pounds 

200

132 x 34

forgot to drop the zero

200

582 x 32

~ 18,000

300

324 x 43

13,932

300

536 x 43 x 6

138,288

300

875 x 43

didn't add when I was supposed to

300

712 x 82

~ 56,000

~70,000

400

799 x 87

69,513

400

A farmer grows 129 red tomato plants and 102 yellow tomato plants. Each plant produces about 32 tomatoes. The farmer plans to sell each tomato for $2. How much money will the farmer make if he sold all of his tomatoes?

$14,784

400

487 x 21

Didn't include commas in my answer. 

400

392 x 38


Is this an overestimate or underestimate?

~16,000

500

Jupiter is about 5 times the distance Earth is from the sun. Earth is about 93 million miles from the sun. About how far is Jupiter from the sun? 

93 million x 5 = 465 million miles 

500

Mrs. Powell has 102 paper clips for class. Mrs. Mochal has twice as many. Mrs. Larson stock piled and has twice as many as Mrs. Mochal. They now have to combine them all for Mrs. Schanbacher. How many do they have in all? 

714 paper clips

500

My mom travels a lot for her job. She flies 2,840 miles each week for 4 weeks. How many miles in all does she fly? 

Forgot the label 

500

750 x 72

Your answer should be an overestimate.


~64,000

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