Math+Casts

Click on a mathcast to see how third and fourth graders solve problems! toc

MathCast-Learn our strategies!
Click on this link to read more about our strategies, how they work, and how to help your child.

=Addition Strategies=

Not many addition strategies because most 4th graders have grasped this concept [|155 + 28] (splitting strategy for addition)

[|Traditional algorithm]

=Subtraction Strategies:=

[|35-18] (compensation strategy for subtraction) [|Adding Up Using a Number Line] (Adding up to subtract, number line) [|Adding Up] (Same as adding up using a number line, just recorded differently.)

[|Compensation with bigger numbers 3,298-327]

Close to Spring time, we will learn the [|US algorithm for Subtraction!] [|Khan Traditional Algorithm Subtraction]

=Multiplication Strategies:=

Beginning Multiplication Strategies for Larger Numbers

Late September early October Strategy to multiply multiplication problems that are bigger than 12X12. Don't split both factors yet! Great strategy to use when one of the numbers is still 12 or smaller. []

To practice the strategy above go to this link, print out array cards to 144, and play big array, small array. If you don't know how to play, watch the video on the link under multiplication games. Make sure and write your mathematical equation each time you cover a big array.

Mid to late October Strategies with 2 digit by 2 digit where both numbers are large like 48x76 and you need to split both numbers to solve. Here are two strategies that w we use a lot. [|Open Area Model] [|Rainbow Strategy]

Other strategies: FOIL [] Box []

Later in the year [|Array Strategy for BIGGER numbers!] [|Lattice also for BIGGER numbers, uses place value] [|See why lattice works here]

=Division Strategies:=

[|Multiplying UP]

[|Partial Quotients] Or the Big 7 strategy.

You Tube has lots of help videos for [|Big 7], ask an adult to pick out some for you.

[|Partial Quotients Power Point]

[|Partial Quotient on Khan Academy]

[|The Progression of Division]

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