Estimation (Approximating a Precise Value) is very useful especially when someone wishes to know whether he/ she has arrived at a logical solution to a problem under study. It is useful to learn about how to estimate the total sum of a bill to avoid immediate overpayments. For example, one can estimate the total amount of shop (supermarket) receipts. The estimate of these receipts can be done by rounding the amount of each item to the nearest half and keeping a running total mentally from the first item to the last one.
Estimation of a Utility Bill
Suppose the following is a shop receipt, with the estimated amount and running total. Consider, the estimation, approximating a precise value for a utility bill.
Shop Item, Actual Amount, Estimated Amount, Running Total.
| Shop Item | Actual Amount | Estimated Amount | Running Total |
|---|---|---|---|
| Item 1 | 4.50 | 4.50 | 4.50 |
| Item 2 | 3.50 | 3.50 | 8 |
| Item 3 | 1.3 | 1.5 | 9.5 |
| Item 4 | 0.60 | 0.5 | 10 |
| Item 5 | 2.95 | 3 | 13 |
| Item 6 | 2.85 | 3 | 16 |
| Item 7 | 1.60 | 1.50 | 17.5 |
| Item 8 | 2.75 | 3 | 20.5 |
| Item 9 | 2.4 | 2.5 | 23 |
| Total | 22.45 | 23 |
From the above example, it can be observed that estimation is a process of finding an estimate of a value. It saves time and results in the nearest possible exact value. An estimate can be overestimated (when the estimate exceeds the actual value) and underestimated (when the estimate falls short of the actual value).
In some cases, an estimate can be performed to round all of the numbers that you are working to the nearest 10 (or 100 or 1000) and then do the necessary calculations. In everyday life, the estimation can be used before you solve a problem in an easier and faster way. It helps you to determine whether your answer is reasonable. Estimation is also useful when you need an approximate amount instead of a precise value.
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