Methods of Multiplication
10/9/2015
Dear Parents,
We began our next unit of study this week: methods of multiplication. The information below will serve as an overview of the unit as you work to support your child at home. Please note that the methods being taught are probably different than the typical strategy you are familiar with. The standard algorithm isn't tested until 5th grade. It will be covered, but not to the same degree as the strategies listed below. If you have any questions, please feel free to contact me. I appreciate your on-going support. Strategies for Multiplication Common Core State Standards: 4.NBT.5 Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the properties of operations. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models. Essential Vocabulary: • multiplication/multiply • division/divide • area • array • factor • square unit • product • area model • expanded notation • algebraic notation Unit Overview: In this unit, students will apply their understanding of place value to help them explore multiple groups or multiplication. Students will utilize their knowledge of base ten and groups of numbers within another number to help them solve for multi-digit multiplication. Students will use their knowledge from 3rd grade with multiplication factors to help them solve larger multi-digit problems. Students will solve multi-digit multiplication problems with the use of various strategies listed below. Students will not be required to use the standard algorithm until 5th grade. Strategies/Skills: Students will build on their understanding of addition and subtraction by using place value strategies to make sense of the standard algorithms. They are expected to use a variety of models to support their reasoning about numbers. • Rectangular Section/Arrays • Area Models • Base Ten blocks • Expanded notation • Algebraic notation Video Support: Video support can be found on The WCPSS Academics YouTube Channel. • http://tinyurl.com/WCPSSAcademicsYouTube o ES 4 Math Whole Number Multiplication w/ Expanded Notation https://www.youtube.com/watch?v=- 8PK7vsIF2Q&list=PLNDkuWRw1gGRpuFSgmHjf07KamFfjq8Gz&index=32 o ES 4 Math Whole Number Multiplication w/ Area Model https://www.youtube.com/watch?v=3TJ9KdEhUbU&list=PLNDkuWRw1gGRpuFSgm Hjf07KamFfjq8Gz&index=6 o ES 4 Math Whole Number Multiplication w/ Base Ten Blocks https://www.youtube.com/watch?v=c6MRuNTwZi8&list=PLNDkuWRw1gGRpuFSgm Hjf07KamFfjq8Gz&index=5
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Mrs. Ana RhyneI teach 4th grade math and science at Weatherstone Elementary School. I graduated from Meredith College with a BA in Spanish and K-6 licensure. Archives
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