In adding and subtracting fractions with unlike denominators, you have to get a least common denominator which is exactly like the least common multiple it just so happens to be in the denominator.

Save guides, add subjects and pick up where you left off with your BBC account. When the denominators are the same, add the numerators. Sometimes the final answer can be simplified. close simplify (a ...

Three, two, one…blast off! Wow, blasting off used five eighths of your fuel. If you used five eighths of your fuel to take off, and another two eighths to get this far, how much fuel have you used? To ...