What is 4/8 of 84?

How to calculate 4/8 of 84?

1. Multiply the whole number by the numerator of the fraction: 84 × 4 = 336
2. Divide this result by denominator of the fraction: 336/8 = 42
3. Simplify by dividing both the numerator and denominator by their GCD (8):
   • 336/8 = 42
   • 8/8 = 1
4. Which gives: 42/1

How does it work?

The principle behind finding a fraction of a number, such as 4/8 of 84, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{4}{8}=\frac{x}{84}$ (where x represents 4/8 of 84)

1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: $4\times 84=8x$
2. Which gives: $336=8x$
3. Divide both sides by 8 to isolate x: $\frac{336}{8}=\frac{8x}{8}$
4. Which gives the result: $\frac{336}{8}=x$ (or $\frac{42}{1}=x$)

Thus, 4/8 of 84 is equal to 42/1 (or 42 in its decimal form).