What is 7/10 of 89?
Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 7/10 of 89? We'll show you a straightforward method to achieve that.
How to calculate 7/10 of 89?
- Multiply the whole number by the numerator of the fraction: 89 × 7 = 623
- Divide this result by denominator of the fraction: 623/10 = 62.3
Since 623/10 is an improper fraction, the result could also be expressed as a mixed number: 62 3/10
How does it work?
The principle behind finding a fraction of a number, such as 7/10 of 89, is rooted in the method of cross-multiplication.
Consider the following proportion: (where x represents 7/10 of 89)
- Using the cross-multiplication method, multiply both numerators by their opposite denominators:
- Which gives:
- Divide both sides by 10 to isolate x:
- Which gives the result:
Thus, 7/10 of 89 is equal to 623/10 (or 62.3 in its decimal form).