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Why do you need a common denominator when adding and subtracting fractions but not when you multiply or divide fractions?
For subtracting and adding you cannot add or subtract unalike things. For multiplication and division you can multiply by whatever you want. In some maths you even multiply by variables such as "x". Or divide by them.
Who invented adding and subtracting?
Addition and subtraction are prehistoric, they were used before man could write, even som animals addd and subtract (raven, crows, apes, etc.)
If the sum of three consecutive even integers is 2010 find the integers?
You can find this by dividing 2010 by three and adding two for the highest integer and subtracting 2 for the lowest integer. 2010/3=630, so the numbers are 628, 630 and 632
When subtracting even and odd numbers what is the rule?
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. Even minus odd is odd.
Is 84 minus 17 even or odd?
It will be odd. Subtracting an odd number from an even number, gives an odd number. 84 - 17 = 67
