Is 1/2 Bigger Than 5/8?

Method 1: Common Denominators

To compare these fractions, we need a common denominator. The denominators are 2 and 8, and the least common denominator (LCD) is 8.

• Step 1. Convert \(\frac{1}{2}\): multiply numerator and denominator by 4.
  \[\frac{1}{2} = \frac{1 \times 4}{2 \times 4} = \frac{4}{8}\]
• Step 2. Keep \(\frac{5}{8}\) as it is — the denominator is already 8.
• Step 3. Compare the numerators: 4 vs 5.
• Step 4. Since 4 is less than 5, we know that \(\frac{1}{2} < \frac{5}{8}\).

Method 2: Cross Multiplication

A quicker way to compare fractions is to cross-multiply. Multiply each numerator by the other fraction's denominator:

• Step 1. Multiply the numerator of the first fraction by the denominator of the second: \(1 \times 8 = 8\).
• Step 2. Multiply the numerator of the second fraction by the denominator of the first: \(5 \times 2 = 10\).
• Step 3. Compare the products: \(8 < 10\), so \(\frac{1}{2} < \frac{5}{8}\).

Method 3: Decimal Comparison

Convert each fraction to a decimal by dividing the numerator by the denominator:

Since 0.5 is less than 0.625, we confirm that \(\frac{1}{2} < \frac{5}{8}\). In percentage terms, \(\frac{1}{2}\) is 50% and \(\frac{5}{8}\) is 62.5%, a difference of 12.5 percentage points.

Why Does This Work?

These fractions have different numerators and different denominators, so we can't compare them directly. By converting to a common denominator of 8, we're cutting both quantities into equal-sized pieces. Then 4 pieces vs 5 pieces is a straightforward comparison.