28 multiplied by 16 is 448.
Oh, dude, math time! So, to cover a 28x16 deck, you'd need 448 square feet of decking. Each 5/4x6x8 board covers about 2.22 square feet, so you'd need roughly 202 deck boards. But hey, maybe grab a few extra in case you miscount or your neighbor's dog decides to snack on one!
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
To estimate and check the reasonableness of an answer, you can use a variety of strategies depending on the context. In mathematics, you can round numbers to the nearest place value and perform quick mental calculations to get a rough estimate. You can also use benchmarks or known facts to compare your answer to. Additionally, you can break down the problem into smaller parts and check each part individually to ensure accuracy.