Our Fraction Addition & Subtraction Algorithm
1) Look at the fractions in the problem to see if they have common denominators. Ex. ½ + ¼=
2) If the denominators are not the same, then change the fractions to equivalent fractions. Ex. ½=2/4 2/4 + ¼=
3) Add or subtract the numerators together (not the denominators)
Ex. 2/4+1/4= (2+1) ¾
4) If the second fraction is bigger then the first fraction you will need to borrow from the whole number.
Ex. 1 ¼ – ¾= 5/4 -3/4= 2/4
5)Move the denominator over to your answer.
Ex. 5/4 – 3/4 = 2/4
6) Add or subtract your whole numbers if there.
7) Simplify the answer if needed.
Ex. 2/4= 1/2
