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A student adds 1.347 + 3.68 on a calculator and gets 50.27 as the answer. Without...

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misstiffanyjean | Student, Grade 11

Posted September 23, 2011 at 3:06 AM via web

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A student adds 1.347 + 3.68 on a calculator and gets 50.27 as the answer. Without adding the number yourself, is this the right answer? Please explain your reasoning.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted September 23, 2011 at 3:14 AM (Answer #1)

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The student is adding 1.347 and 3.68 which is the same as 3.680

The result cannot be 50.27 because 7 is the third digit after the decimal point, not the second. Also 8 + 4 = 12 which implies that 2 is the second digit after the decimal point in the result not the first. Again, 6 + 3 + 1 = 10 making 0 the first digit after the decimal and the number before the decimal is 5.

Apart from this, the student is adding small numbers like 1.347 and 3.68, the answer is a number around 5 not a large number like 50.

The result the students gets by adding 1.347 and 3.68 using a calculator is wrong.

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atyourservice | Student, Grade 10

Posted June 30, 2014 at 12:46 PM (Answer #2)

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No because there is no way you can add 1 and 3 and end up with 50

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taangerine | Student, Grade 11

Posted July 27, 2014 at 6:52 AM (Answer #3)

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Without adding the numbers itself,  1.347 + 3.68 can not equal 50.27 because you have to line up the decimals before you add. Furthermore, if you rounded the numbers to the nearest whole number, 1+4=5. The answer should be around 5 not 50.27. 

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