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.
• square unit
• area model
• expanded notation
• algebraic notation
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.
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 can be found on The WCPSS Academics YouTube Channel.
o ES 4 Math Whole Number Multiplication w/ Expanded Notation
o ES 4 Math Whole Number Multiplication w/ Area Model
o ES 4 Math Whole Number Multiplication w/ Base Ten Blocks
Mrs. Ana Rhyne
I teach 4th grade math and science at Weatherstone Elementary School. I graduated from Meredith College with a BA in Spanish and K-6 licensure.