Is 4/5 Bigger Than 8/11?

Method 1: Common Denominators

To compare these fractions, we need a common denominator. The denominators are 5 and 11, and the least common denominator (LCD) is 55.

• Step 1. Convert \(\frac{4}{5}\): multiply numerator and denominator by 11.
  \[\frac{4}{5} = \frac{4 \times 11}{5 \times 11} = \frac{44}{55}\]
• Step 2. Convert \(\frac{8}{11}\): multiply numerator and denominator by 5.
  \[\frac{8}{11} = \frac{8 \times 5}{11 \times 5} = \frac{40}{55}\]
• Step 3. Compare the numerators: 44 vs 40.
• Step 4. Since 44 is greater than 40, we know that \(\frac{4}{5} > \frac{8}{11}\).

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: \(4 \times 11 = 44\).
• Step 2. Multiply the numerator of the second fraction by the denominator of the first: \(8 \times 5 = 40\).
• Step 3. Compare the products: \(44 > 40\), so \(\frac{4}{5} > \frac{8}{11}\).

Method 3: Decimal Comparison

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

Since 0.8 is greater than 0.727273, we confirm that \(\frac{4}{5} > \frac{8}{11}\). In percentage terms, \(\frac{4}{5}\) is 80% and \(\frac{8}{11}\) is 72.7273%, a difference of 7.2727 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 55, we're cutting both quantities into equal-sized pieces. Then 44 pieces vs 40 pieces is a straightforward comparison.