\[\frac{1}{2}+\frac{3}{4}+\frac{3}{12}\]
1
Simplify  312\frac{3}{12}  to  14\frac{1}{4}.
12+34+14\frac{1}{2}+\frac{3}{4}+\frac{1}{4}

2
Find the Least Common Denominator (LCD) of 12,34,14\frac{1}{2},\frac{3}{4},\frac{1}{4}. In other words, find the Least Common Multiple (LCM) of 2,4,42,4,4.
LCD = 44

3
Make the denominators the same as the LCD.
1×22×2+34+14\frac{1\times 2}{2\times 2}+\frac{3}{4}+\frac{1}{4}

4
Simplify. Denominators are now the same.
24+34+14\frac{2}{4}+\frac{3}{4}+\frac{1}{4}

5
Join the denominators.
2+3+14\frac{2+3+1}{4}

6
Simplify.
64\frac{6}{4}

7
Simplify.
32\frac{3}{2}

8
Convert to mixed fraction.
1121\frac{1}{2}

Done

Decimal Form: 1.5
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