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If you are building a 28x16 deck how many 5-4x6x8 deck boards do you need?
approx 112 boards better get 115 to be sure.
How many grams in two pounds?
There are 453.59237 grams in one pound. Therefore to get amount of grams in pounds, value in pounds has to be multiplied by amount of grams in one pound:2.5 pounds = [pounds] * 453.59237 = 2.5 * 453.59237 = 1133.9809 grams2.5 lbs = 1 133.980925 grams on earth. http://www.onlineconversion.com/weight_all.htm
How do you estimate to check that your answer is reasonable?
To estimate an answer the numbers are rounded and the calculation done. It is often suggested to round to 1 sig fig as this will give a general indication of how big the answer should be. eg 1234 ÷ 31 → 1000 ÷ 30 ≈ 33.33 so an answer in the region of about 30 to 40 is expected. A slight variation from this can make the calculation easier, eg rounding the 1234 above to 2 sig fig gives 1200 ÷ 30 which is easier as 1200 is a multiple of 30 (and actually much closer to the real answer) giving 1200 ÷ 30 = 40; the real answer is approx 39.81.
