Mental Calculation Beginner En play online

Mental calculation refers to doing math calculations in your head without the use of tools such as calculators, pen and paper, or abacus.
Mental calculation helps us function in our daily lives in situations such as:
- Shopping adding tax or figuring out a sale price.
- Cooking - using proportional thinking to alter a recipe.
- Calculating a tip.
- Building something.
- Converting from one type of unit into another - such as ounces to pounds or kilometers to miles.
- Using a foreign currency.
- Investing.
- Figuring out a score or a grade.
- Comparing values of products or services.