# What is a fifth of 50

## This is math 2, textbook

Percentage calculation C1 78 Ella discovers a T-shirt while selling in a clothing store. Her mother says: “Very good. It's 50 percent off. ”Not sure what this means, Ella asks. The mother explains: “One percent is a hundredth. 50 percent therefore equals half. The T-shirt previously cost € 18, now it only costs half as much, i.e. €. Ella represents the meaning of one percent in mathematical notation: 1% š 1 ___ 100 = 0.01. She recognizes that you can represent percentages both in fractions and as a decimal number. Ella makes a table to show her math teacher to check. Percentage fraction Decimal number 1 percent 1% 1 ___ 100 0.01 1 hundredth 5 percent 5% 5 ___ 100 = 1 __ 20 0.05 5 hundredths = 1 twentieth 10 percent 10% 10 ___ 100 = 1 __ 10 10 hundredths = 1 tenth 20 percent 20% 20 ___ 100 = 1 _ 5 0.20 20 hundredths = 1 fifth 25 percent 25% 25 ___ 100 = 1 _ 4 25 hundredths = 1 quarter 50 percent 50% 50 ___ 100 = 1 _ 2 50 hundredths = 1 Half 75 percent 75% 75 ___ 100 = 3 _ 4 75 hundredths = 3 quarters 100 percent 100 ___ 100 = 1 1.00 100 hundredths = 1 whole 200 percent 200% 200 ___ 100 = 2 2.00 200 hundredths = 2 whole ( the double) Note Often the percentage value W is also referred to as percentage A. The base value G corresponds to the whole or 100% and the percentage value W corresponds to p% of the base value. interactive preliminary exercise 7by8a4 AH p. 23 One percent corresponds to the hundredth part of a whole. It can be represented in both fractional and decimal notation. 1% š 1 ___ 100 = 0.01 (1 hundredth) One hundred percent is a whole. 100% š 1 Three terms are particularly important for the percentage calculation: the base value G, the percentage value W and the percentage p%. Percent Example Of the 28 children in class 2 B, 14 like math, that's 50%. Basic value G Percentage W Percentage p% 1 Basic terms For testing purposes only - property of the publisher öbv