When you estimate a number, a temperature, or a weight, you do not count things one by one or use a measuring tool. You look at a group of things without counting them and try to get a rough idea of their number, or you try to weigh something in your hand instead of on a balance. You feel hot and say “My temperature must be 38 degrees” or you look at a room and say that you estimate its area as 10 × 8 feet.

　　But in many situations in ordinary life we do not have time to measure things and must depend on estimates. Drivers do not have time to measure the distance between their own car and a car which is coming near. They must guess it. The guess or estimate will be based on their past experience. Experienced cooks do not trouble to measure the amount of salt they put into the soup or sugar they mix with flour.

　　Suppose a man comes into the house and says “There are two inches of snow on the road”. His statement is only an estimate, but we believe it because we think that it is roughly correct. We put our boots on before we go into the snow.

　　For practical purposes in some situations it is safe to make estimates of quantity, but in other situations it is obviously dangerous. If it is your job to weigh drugs or make airplanes, do not depend on guessing but use an accurate instrument.

　　5. The writer suggests that in our daily life the estimate of a value or an amount is_______.

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