Lila and her friends are troubled when they discover the dog park does not have a bench for eighty-year-old Mr. Romero to use, so they decide to start a dog-wash to raise money for one, and learn about percentages along the way.
Explains that decimals name numbers that are less than one and that percents compare numbers with 100. Is .25 larger or smaller than .4? Tenths grids, hundredths grids and number lines come to the rescue and are also used to identify decimals and demonstrate adding and subtracting. Also demonstrates that it pays to understand all about decimals and decimal points when dealing with money. From pieces of a chocolate bar to the price of a movie ticket, shows that decimals and percents are a big part of everyday life.
Looks at fractions, decimals, and percents as different ways of describing pieces, parts, and portions in the language of mathematics. Presented in English and Spanish.
"Models how the techniques of conducting mathematical number talks and number strings enable students to grapple with number relationships, analyze their justifications and explanations, and communicate and solidify these critical understandings."--Page xxv.
Secret agent Matt Mattics uses his knowledge of percentages to save the day when the evil Dr. Strangeglove activates an Electronic Numbers Net to remove calculations from the airwaves.
