# What is 1/1 of 78?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 1/1 of 78? We'll show you a straightforward method to achieve that.

## How to calculate 1/1 of 78?

- Multiply the whole number by the numerator of the fraction: 78 × 1 = 78
- Divide this result by denominator of the fraction: 78/1 =
**78**

## How does it work?

The principle behind finding a fraction of a number, such as 1/1 of 78, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{1}{1}=\frac{x}{78}$ (where `x` represents 1/1 of 78)

- Using the cross-multiplication method, multiply both numerators by their opposite denominators: $1\times 78=1x$
- Which gives: $78=1x$
- Divide both sides by 1 to isolate
`x`: $\frac{78}{1}=\frac{1x}{1}$ - Which gives the result: $\frac{78}{1}=x$

Thus, 1/1 of 78 is equal to **78/1** (or 78 in its decimal form).