(2-3) Adding Fractions. 3 1 4 5 5 5 1 + 1 = ? 2 4 = 2 1 3 + = 4 4 4 1 2 since = (the Least Common Multiple of 2, 4 is 4) 2 4 1 1 2 1 3 so + = + = 2 4 4 4 4 1 3 Think how to find + using models. 2 5 28