Multi-Digit Multiplication: 3 Strategies

There are many ways to solve multi-digit multiplication problems. Choose the strategy that works with your brain! Here are three of them...

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No matter which strategy we use, the solution remains the same!

427 x 24 = 10,248

If you do not have your X Facts memorized, 5th grade math can take a long time to calculate. I would suggest gluing a Multiplication Chart onto the inside of your Math notebook cover. That way you can refer to it all year.

[click here for a printable X Chart]

  
Here are a few sites that may help with multiplication...

X GAMES!

Partial Product Jeopardy

The Amoeba Multiplication Game

multiplication.com

Timez Attack

  

Keep up the great work, kids!

Using Al Gore Algorithms to Multiply

Fifth graders are kicking off their math year with  
multiplication algorithms. 

No not Al Gore. 

I said, "AL-GOR-ITHMs."

 

The algorithm we're dealing with today will help us to solve multiplication problems in 4 steps.  

X the Ones

Magic Zero

X the Tens

Add 'em Up! 

This video will help explain in more detail...

Let's try it...

          

This year, it will be helpful to solve problems on graph paper, so that you line digits up correctly. Click on the image below to download printable graph paper! 😄

If you are having a hard time with this concept because you don't have the multiplication facts memorized, please feel free to add this multiplication chart to your spiral. You will use it A LOT this year!

Partial Products

 This week in Class Connect we are learning how to

 multiply multi-digit numbers using partial products.

 There are many ways to multiply multi-digit numbers. One way is my using a standard algorithm, or recipe. This week we talked about a newer method called The Partial Product Method. Partial products are used as intermediate steps in calculating larger products.  

Here is a video explaining how to solve a multiplication problem
using the Partial Product Method.

When solving problems like this, it's very important to write neatly and keep everything lined up. One trick is to use graph paper instead of lined paper. The grids help with lining numbers up before you add.

If you do not have your X Facts memorized, 5th grade math can take a long time to calculate. I would suggest printing the Multiplication Chart below and gluing it onto the inside of your back spiral cover. That way you can refer to it all year.

[click here for a printable X Chart]

 
Here are a few sites that may help with multiplication...

X GAMES!

Partial Product Jeopardy

The Amoeba Multiplication Game

multiplication.com

Timez Attack

 

Keep up the great work, kids!

X Fractions with Scaling

This week in math we are learning how to predict the outcome of a multiplication problem by looking at the factors. When fractions are involved it's easy to decide if the product will be greater than or less than the original number.

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Before moving on, let's watch a silly movie about the different types of fractions...

rude, polite, and confused.

(or something like that)

Anywhooooo...

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If you would like to watch a very helpful video about this concept, go to Learn Zillion and type the code below into the search box.

Code: LZ3401

Here is another look at my notebook page from this lesson. Check your work to make sure your answers are correct and your notebook is complete. You can click on the image to enlarge it.

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Many of your answers to the broccoli cheese soup and chocolate pudding questions made me giggle. 

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What about Oreo cookies? 

Would you rather have 4 Oreos or 4 x 1/4 Oreos? 

(milk included)

Mmmmm... Orrrreeeeeeos...

Me Like Fractions

So, now we are moving on to fractions. Last week we reviewed simplifying fractions. You will need that skill and everything you know about multiplication to multiply fractions this week.

Moving on...

What does it mean to multiply fractions?

One way to multiply fractions is to use the Standard Method that's been around for decades! You multiply across (numerator x numerator & denominator x denominator).

Here is a video that I find very helpful and I think that you will too.

Another way to multiply fractions is to use models.

This mini-lesson will help to explain the models method...

Whether you are a fraction expert or you need a little extra practice, 

these lessons and games will come in handy...

Multiplying Fractions

Multiplying Fractions with Whole and Mixed Numbers

Soccer Shootout

Multiply Fractions and Whole Numbers Practice

See y'all next week!