calculate a mentally
The phrase 'calcular un porcentaje mentalmente' in Spanish translates to 'calculate a percentage mentally' in English. This refers to the process of figuring out a certain percentage of a quantity in your mind, without the use of a calculator or other tools. For example, if you wanted to calculate 20% of 50 mentally, you would determine that it is 10.
It is possible to calculate a percentage mentally if you practice enough.
This sentence suggests that doing mental percentage calculations is a skill one can develop through adequate practice.
If you find it hard to calculate a percentage mentally, you could try using a calculator.
This sentence provides advice for handling difficulties in mental percentage calculation, suggesting the use of a calculator as an alternative.
The ability to calculate a percentage mentally can be very useful in certain everyday situations.
This sentence points out the practical utility of the ability to perform mental percentage calculations in everyday life scenarios.