Wednesday, January 16, 2019

Bridges: Multiplication Strategies

We have spent A LOT of time learning soooo many multiplication strategies. Many of the strategies are the kind we can learn to compute in our heads like Over Strategy, and Doubling and Halving. Others require us to compute the numbers like Partial Products, and the Standard Algorithm, which was our final outcome: 
Grade 5 » Number & Operations in Base Ten » Perform operations with multi-digit whole numbers and with decimals to hundredths.  -Fluently multiply multi-digit whole numbers using the standard algorithm. 
Here are some examples of the kind of work we've done to go from our number sense strategies to the algorithm. 


Here is the classroom poster showing the many different strategies we learned
 to multiply multi-digit numbers. 
Next we dive into using some of these strategies to divide, starting with the Ratio Table. Here's an example of today's work. 











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