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DEVELOPING ESTIMATION SKILLS : A study was done with some Class 3 and Class 4 children of five village schools to gauge how well they had understood the standard algorithms. The children were asked to solve problems of the type 1234 + 469. The responses were very interesting. Many of them were:
The children were; surprised by such answers. Clearly, their ability to estimate the approximate size of the answer was undeveloped. Therefore, they didn't ask themselves or, answer, "Does my answer seem reasonable?"
Why is this ability to estimate the computed result important? Don't we apply it again and again in our daily lives'? For instance, when we are buying several things, and want to quickly make sure that the total cost is within our budget, isn't this skill we use.
The ability to estimate computed results also helps us to detect arithmetical errors. Even when we use calculators, it helps us to quickly check if we haven't pressed any wrong buttons!.You can think of other ways in which this ability helps, while doing the following exercise.
Find the common difference of an AP whose first term is 100 and sum of whose first 6 terms is 5 times the sum of next 6 terms. Ans: a = 100 APQ a 1 + a 2 + ....... a 6
By the method of completion of squares show that the equation 4x 2 +3x +5 = 0 has no real roots. Ans: 4 x 2 +3 x +5=0 ⇒ x 2 + 3/4 x + 5 = 0 ⇒ x 2 + 3/4 x +
adison earned $25 mowing her neighbor''s lawn. then she loaned her friend $18, and got $50 from her grandmother for her birthday. she now has $86. how much money did adison have to
how do you solve for porportions?
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sum of zero of polynomial x2-2x+1is equal to sum of zero of polynomial x3-2x+x then find the product of all the three zero of the second polynomial
Example of Trig Substitutions Evaluate the subsequent integral. ∫ √((25x 2 - 4) / x) (dx) Solution In this type of case the substitution u = 25x 2 - 4 will not wo
The temperature at midnight was 4°F. Through 2 A.M. it had dropped 9°F. What was the temperature at 2 A.M.? If the temperature is only 4° and drops 9°, it goes below zero. It d
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if two lines in s plane never intersect then they are parallel
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