Multiply multi-digit numbers and assess the reasonableness of the product.
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If you need to adapt or shorten this lesson for remote learning, we suggest prioritizing Anchor Task 2 (can be done independently). Find more guidance on adapting our math curriculum for remote learning here.
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Use the digits 1 to 9, at most one time each, to create two numbers that have a product as close to 500,000 as possible.
You may use any length of factors as you would need, for example, eight-digit by one-digit or four-digit by three-digit.
Multiplication of Large Numbers by is made available on Open Middle under the CC BY-NC-SA 4.0 license. Accessed Dec. 7, 2018, 1:04 p.m..
Modified by Fishtank Learning, Inc.Solve. Then estimate to assess the reasonableness of your answer. Then explain why your estimated product was greater or less than your actual product.
Grade 5 Mathematics > Module 2 > Topic B > Lesson 8 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Modified by Fishtank Learning, Inc.?
For parts (a) and (b) below,
This is Elmer’s work on a multiplication problem.
Elmer's Multiplication Error, accessed on Sept. 28, 2017, 3:18 p.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
Modified by Fishtank Learning, Inc.?
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