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It's the bottom one. When doing sums with two different fractions we always had to find the lowest common denominator. It's how I remember.

e.g: 3/4 + 1/2 - 2 = 4 twice. 4 = 4 once. 3x1 = 3. 1x2 = 2. 3/4 + 2/4 = 5/4 = 1/4

LCD = 4

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Q: Which number is the denominator in a fraction?
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