Here’s why ‘5+5+5=15′ is incorrect under Common Core
Here’s a “repeated addition” problem in Common Core mathematics that’s taught in third grade in US schools:“Use the repeated-addition strategy to solve 5×3.”
Amazingly, if you answer the question with 5+5+5=15, you would be wrong, even though it’s mathematically correct. The correct answer is 3+3+3+3+3 because you’re supposed to read 5×3 as “five groups of three.” So “three groups of five” is wrong. What the HELL?!
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The situation gets even worse. Wait until you see one student’s quiz paper and what one teacher marked him wrong on …
Here’s a quiz taken by a 3rd grade student on some of the most fundamental aspects of basic whole-number multiplication.
The first question asks the student to calculate 5 x 3 using repeated addition – the problem mentioned previously. The student wrote 5 + 5 + 5 = 15, and was “incorrect.”
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A second question asks the student to calculate 4 x 6 using an array and the teacher’s response is just as insane. The student draws an array with six rows and four columns, getting the answer that 4 x 6 = 24. The teacher again marked the question incorrect and drew in a nearly identical array of four rows and six columns:
Watch a video on the topic here:
http://www.businessinsider.com/why-55515-is-wrong-under-the-common-core-2015-10#ooid=5tOWFkeDrFViGnshAQUiBuc5jR36G3p5
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