Presentation on theme: "Algorithms in Everyday Math A Parents Guide Rina Iati South Western School District Math Coach 54 X 36 23 ) 893 78 + 54 100 - 21."— Presentation transcript:
Algorithms in Everyday Math A Parents Guide Rina Iati South Western School District Math Coach 54 X )
5. I dont understand why your teacher is making you do it this way. 4. Thats the most ridiculous thing Ive ever seen. 3. The old way is so much faster. 2. The old way worked for hundreds of years, so why are they changing it now? 1 Thats not how you do it. Ill show the right way to do it.
Why are we changing the way we teach math? What is the purpose of teaching multiple algorithms?
The traditional, rote approach to teaching algorithms fosters beliefs such as: Math consists mostly of symbols on paper Following the rules of math is most important Math is mostly memorizing facts and rules Speed and accuracy are more important than understanding There is one right way to solve any problem Math symbols and rules have little to do with common sense, intuition or the real world.
our advanced calculus and AP physics students rate last in the world. (Wm. Schmidt, MSU, The Widening Achievement Gap) Our 8th grade advanced students rank in the middle of the pack in the world.(See TIMS and TIMSS-R 1996 and In one study only 60% of 10 year olds achieved mastery of subtraction using the standard borrowing algorithm. A Japanese study found that only 56% of third graders and 74% of fifth graders achieved mastery of this algorithm. Traditional math instruction isnt working as well as we might think.
Research tells us that between 3rd and 6th grade the equivalent of one year is spent teaching long division. Yet, when 17 year olds were tested for division with a 2 digit divisor, fewer than 50% answered it correctly. Children learn to perform the steps (rules) of the algorithm without thinking about the math behind it
900 ÷30 = __ 30 ) =___
Problems can, and should, be solved in more than one way Studying several algorithms for an operation can help students understand the operation Providing several alternative algorithms for an operation affords flexibility Presenting several alternatives gives the message that mathematics is a creative field. The focus algorithms were selected because they reveal more about underlying concepts and are less likely to lead to wrong answers
If you consider the traditional instructional model to be handing the kid a shovel and making him expert in using the shovel, then the EM approach is handing the kid a fully-stocked tool shed and training him to select the most appropriate tool from the shed to apply to the math task at hand. The kid who only knows the shovel can only respond if the task is digging, but the kid who owns the tool shed can respond flexibly to any task. Bruce Harrison
Learn new algorithms/ methods Analyze the concepts reinforced in the methods Determine what math thinking takes place while performing these methods Discuss the advantages of new methods vs. traditional methods