Front end : use ONLY the first few # Relative size : use the FULL # and round it
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The difference is 4
estimation is to think of an answer before measuring the quantity and approximation is to round off.
Mr. Kevin thinks that estimation can help students get real sense of conversion between fraction and percentage.
You know that 8 x 50 is 400 and 8 x 60 is 480. The quotient will be between 50 and 60.
If the consequences when the estimation or calculation error is at its minimum are very seriously negative. For example, suppose the lifting capacity of a crane is 10 tons to the nearest ton. That statement implies that the capacity is anything between 9.5 and 10.5 tons. You must use the underestimate: 9.5 tons since that could be the true limit, and the crane could fail at anything higher.