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Wondering how to figure out which fraction is bigger without a calculator? Comparing \(\frac{3}{10}\) and \(\frac{9}{10}\) is straightforward once you know the right approach. Below we walk through three proven methods for comparing fractions: finding a common denominator, cross multiplication, and converting to decimals. Each method will give you the same answer, so choose the one that feels easiest.
These fractions already share the same denominator: 10. We just need to compare the numerators.
A quicker way to compare fractions is to cross-multiply. Multiply each numerator by the other fraction's denominator:
Convert each fraction to a decimal by dividing the numerator by the denominator:
Since 0.3 is less than 0.9, we confirm that \(\frac{3}{10} < \frac{9}{10}\). In percentage terms, \(\frac{3}{10}\) is 30% and \(\frac{9}{10}\) is 90%, a difference of 60 percentage points.
When two fractions share the same denominator, the pieces are the same size. A fraction with more pieces (a larger numerator) is simply a larger amount. Since 9 pieces is more than 3 pieces of the same size, \(\frac{9}{10}\) is the larger fraction.
\(\frac{9}{10}\) is bigger. As a decimal, \(\frac{9}{10}\) = 0.9 while \(\frac{3}{10}\) = 0.3.
The difference is \(\frac{3}{5}\), which equals 0.6 in decimal form (60 percentage points).
You can use three methods: find a common denominator and compare numerators, cross-multiply and compare the products, or convert both fractions to decimals. All three methods confirm that \(\frac{9}{10}\) \(>\) \(\frac{3}{10}\).