Tuesday, we added one more conversion, convert fractions to decimals and then to percents. So what is a percent? Percent is a comparison to 100. We have already learned to convert a fraction to a decimal, divide the numerator by the denominator (top in bottom out). To convert a terminating decimal to a fraction you say it correctly using place value and a repeating decimal you do the "9-Thing."
To convert a decimal to a percent you just move the decimal 2 places to the right and add a percent sign.
examples:
0.25 = 25%
1.5 = 150%
To convert a percent to a decimal you move the decimal 2 places to the left and take off the percent sign.
examples:
46% = 0.46
125% = 1.25
The hardest thing to remember is which way you move the decimal. We think about Dr. Pepper to helps us remember. Dr. Pepper means to change a decimal to a percent you move the decimal to the right D to P. To convert a percent to a decimal you move the decimal to the left which is P to D. You always move the decimal 2 places because there are 2 zeros on 100.
Students will have to give the missing values when given either the fraction, the decimal, or the percent.
Fraction Decimal Percent
3/4 .75 75%
1 65/100 1.65 165%
1 13/20
4/5 0.8 80%
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