Exercise 2 Page 276

To find the percentage of 400 that 2 is, we will create and solve an equation. When dealing with percentages, remember that we can multiply the percent by the whole value to find the partial value. In our case, the whole value is 400, and the partial value is 2. We are looking for the percent x. x %*400=2 ⇔ x/100 * 400=2 Now, we can solve for the unknown percentage.

x/100 * 400=2

MoveRightFacToNum

a/c* b = a* b/c

400x/100=2

MultEqn

LHS * 100=RHS* 100

400x=200

DivEqn

.LHS /400.=.RHS /400.

x=200/400

CalcQuot

Calculate quotient

x=0.5

An answer of x=0.5 tells us that 2 is 0.5 % of 400.