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by crossing out numbers like it it is 7/14 * 2/5= 7/35

You cross out when you see the same number as a factor on top and bottom.

e.g.: 2/2 simplifies to 1

4/2 = (2x2)/2 = 2

12/6 = (2x2x3)/(2x3) = (2x3)/3 = 2

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Adding mixed numbers with unlike denominators?

First convert the mixed numbers into "top heavy (or "improper) fractions". Now multiply each of the improper fractions by each other - this makes the denominators the same. Now you can add both the fractions together (and cancel down if necessary).


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All rational numbers can be expressed as fractions whereas irrational numbers can't.


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Rational numbers can be expressed as fractions and fractions can be equivalent as for example 3/4 has the same value as 9/12


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Fractions help with numbers that are not whole numbers.


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