What is 2/8 of 90?

How to calculate 2/8 of 90?

1. Multiply the whole number by the numerator of the fraction: 90 × 2 = 180
2. Divide this result by denominator of the fraction: 180/8 = 22.5
3. Simplify by dividing both the numerator and denominator by their GCD (4):
   • 180/4 = 45
   • 8/4 = 2
4. Which gives: 45/2

Since 45/2 is an improper fraction, the result could also be expressed as a mixed number: 22 1/2

How does it work?

The principle behind finding a fraction of a number, such as 2/8 of 90, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{2}{8}=\frac{x}{90}$ (where x represents 2/8 of 90)

1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: $2\times 90=8x$
2. Which gives: $180=8x$
3. Divide both sides by 8 to isolate x: $\frac{180}{8}=\frac{8x}{8}$
4. Which gives the result: $\frac{180}{8}=x$ (or $\frac{45}{2}=x$)

Thus, 2/8 of 90 is equal to 45/2 (or 22.5 in its decimal form).