What are Rounding and Estimating?
Rounding and estimating are mathematical techniques used to simplify calculations. Rounding adjusts numbers to a specified precision, making them easier to work with, while estimating provides an approximate value, helping with quick assessments. Together, they enhance numerical comprehension and facilitate faster decision-making in various contexts.
In many cases, some calculations may require an exact answer instead of an estimation. Pretend that you buy some groceries from the supermarket.
You give the cashier 20 dollars for a purchase of 16.87 dollars. An exact answer is important here so you get back the change that you deserve. You definitely do not want the cashier to estimate the money you get back.
When is an estimation necessary?
For other situations an estimate is sufficient unless you really want to be picky about it.
For example, suppose you lost a certain amount of pounds over the course of a year, you could be satisfied with an estimate. See below a list of the pounds you may have lost.
2.4, 2.5, 2.6, 2.3, 2.45, 2.60, 2.41, 2.35, 2.56, 2.49
Cluster estimation may help you see that you lost approximately 2.5 × 10 pounds or 25 pounds.
when is rounding necessary?
Rounding may be needed in various situations, such as when budgeting, where precise figures can be cumbersome, so costs are rounded to the nearest dollar for simplicity.
In cooking, measurements like 2.7 cups might be rounded to 3 cups for easier measurement. Additionally, in statistics, data points may be rounded to maintain clarity when presenting averages or totals. These practices enhance readability and facilitate quicker decision-making.
See below some rounding and estimation techniques
