What is 7/1 of 15?
Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 7/1 of 15? We'll show you a straightforward method to achieve that.
How to calculate 7/1 of 15?
- Multiply the whole number by the numerator of the fraction: 15 × 7 = 105
- Divide this result by denominator of the fraction: 105/1 = 105
How does it work?
The principle behind finding a fraction of a number, such as 7/1 of 15, is rooted in the method of cross-multiplication.
Consider the following proportion: (where x represents 7/1 of 15)
- Using the cross-multiplication method, multiply both numerators by their opposite denominators:
- Which gives:
- Divide both sides by 1 to isolate x:
- Which gives the result:
Thus, 7/1 of 15 is equal to 105/1 (or 105 in its decimal form).