Name: Angela
Questions: 2. describe why, not just how, to round decimals Thank You! Hi Angela,If your students have calculated the area of a rectangle with integer sides by multiplying the integers then you can use this concept to represent the multiplication of fractions. Suppose that you want to multiply ^{1}/_{2} and ^{3}/_{4}. Draw a unit square and divide it in half in one direction and in quarters in the other. The region shaded in purple below has an area represented by ^{1}/_{2} x ^{3}/_{4} In this construction you divided the unit square into eight, equal sized rectangles so each rectangle represents oneeighth on the unit square. Hence the purple region is threeeights of the unit square so that ^{1}/_{2} x ^{3}/_{4} = ^{3}/_{8} For your second question one example that immediately come to mind is with money. Suppose that you purchased something for $28.95 and you have to pay 7% tax. Then the tax is $28.95 x 0.07 = $2.0265. Since we don't have coins worth less than $0.01 we round the tax to $2.03. Cheers,Penny
