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# Mental Multiplication: Learn to Multiply Up to 99x99 in Your Head!

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5th - 9th
Subjects
Resource Type
Standards
Formats Included
• PDF
Pages
7 pages
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### Description

Amaze your students! With very little practice prior to class, you can multiply a pair of two-digit numbers in your head. Let them be impressed for a while; the adulation will feel great! Eventually though, they will demand that you show them the trick, even though it requires them to do math! This is a great follow-up activity to my companion lesson, “Area Multiplication”.
Includes journal prompts, homework master, extensions, Common Core standards addressed, and answer key.
Total Pages
7 pages
Included
Teaching Duration
50 minutes
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### Standards

to see state-specific standards (only available in the US).
Recognize that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left.
Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote powers of 10.