2 X 2-digit Multiplication

We have been working hard on learning and practicing the process of multiplying up to 4 digits by 1 digit and 2 digits by 2 digits.  Just learning how to use the “old school” algorithm to solve the problem is no longer enough.  The kids have to be able to explain the process of why that “old school” algorithm works.  I’ve posted short video clips that help to show the multiplication process and what we are expecting the kids to understand and do.  Of course, it is extremely important that the kids learn and memorize their basic multiplication facts!

Multiplication with base ten blocks/area models:


“Grid /Window/Box” Method of multiplying 2-digit by 2-digit numbers:

The Process of Multiplication

We have begun multiplying 2-,3-, & 4-digit numbers by a 1-digit number using the distributive property (expanded form) and area models.  We viewed the videos below to help us understand how we use the values of the digits to multiply.  Ask your child to teach you how to do this type of multiplication.  If he/she can teach it to you, then you  know he/she has learned it!

Multiplying with Area Models

Parents,  I’ve given the kids a homework assignment–to teach YOU how to multiply using area models (base-ten blocks).  Unless you are an upper elementary math teacher or you’ve had a 4th grader in the last few years, you most likely have no idea what I’m talking about!  Learning how to use the “old school” algorithm to solve a problem is no longer enough.  The kids have to be able to explain the process of WHY that “old school” algorithm works. Using area models is a way for kids to picture and see what is really happening within a multiplication problem.  Just in case you need some clarification on your child’s “teaching”, here are 2 videos that we used in class.  🙂

Multiplication News

The first multiplication facts test was given at the end of last week, and the students were given their scores & tests back today.  The tests were put in their graded work binders which will be sent home tomorrow.  You may also check your child’s grades by signing into Skyward.

A re-test will be given on Friday to all students whose grade was below a 90.  Students who made a 90-99 have the option of re-taking the test and trying to improve their scores.  Those students who made 100 or who have chosen not to re-test will have some time to play educational games on electronic devices during the 20-min. testing time.  Should a student’s test grade improve, the X Facts Test grade in the gradebook will be adjusted to reflect the improved grade.  A declining grade will not be adjusted. 

Below are some practice links to Quizlet.  Clicking on a link below will allow many options to practice a set of facts:  Flashcards, Learn, Test, Scatter, & Space Race.

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Multiplication Fact Review

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Marvelous Multipliers!  One of our 4th grade math goals this year is to be fluent in our multiplication facts, and we’re off to a good start!  The kids are working hard these first 2 weeks to master their facts so they can be successful this year…and so they don’t have to have math homework EVERY week! 😉  A big “THANK YOU” to all of the parents for supporting your child in this endeavor! I KNOW they can do it!  Here are some links to websites that can be used to practice facts:

Students can practice facts with an interactive times table, online quizzes, and games.

Students can view short videos and songs that will help them to learn specific times tables.

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