Tuesday, April 13, 2010

finding the perimeter of a scalene triangle

we have to use the altitude to get a right triangle to get to the Pythagorean theorem.

decimal number addition

we must line up the decimals when we add.

solving multi step problems

here are a few tips before i go over the examples.
here are the examples explained in great detail.

rounding decimal numbers

this is a step by step approach to rounding.

percents

in this example we go from a drawing to a fraction to a percent. we use the concept of ratios. this is an introductory idea. eventually we see we must divide the fraction to get a decimal, then move the decimal to the right 2 places to get the percent value.