Mental calculation forces students to think about numbers and number relationships. Estimation Mathematics is a discipline that we often characterize by its precision in common usage. However, we do not always need, nor are we sometimes able, to attain a high degree of accuracy in our calculations. Whether to produce a rough estimate, a fine estimate, or an exact answer depends on the ultimate use of the estimate. Most often, practical situations involve estimations rather than exact numbers.
Approximate numbers are often easier to comprehend and they can also help to develop consistency.
When counting, measuring, or calculating, it is often advantageous to estimate prior to finding an exact solution. Development of the concept and skills of estimation helps students to adapt mathematics in a variety of situations. The increased emphasis of estimation in the curriculum corresponds with the important role estimation assumes in daily life. Integration Course content should be presented within the context of its application in daily living, integrated within the various branches of mathematics, and related to other academic disciplines. Integration may include any one of the several forms.