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Porcentajes Matemáticas Middle School Math Porcentajes

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Name _____________________________

Date ___________________

Por ciento
Completa.

1.   * Esta es una hoja prehecha. Utilice el enlace arriba de la página para un imprimible.

2.   Jordan donated eleven percent of the money she earned this summer to her local fire department. If she donated a total of $132how much did she earn this summer?

Completa.

1.   Julia is performing an experiment using gel electrophoresis. She is monitoring the migration of RNA through the gel. The shortest fragments of RNA have traveled4.5cm a través del gel y los fragmentos más largos han viajado sólo1.4cm. The longest fragments have traveled what percent of the distance of the shortest fragments? Round your answer to the nearest hundredth of a percent.

2.   La población inicial de protistas en un cultivo es4,949. La población final después de una semana era8,435. ¿La población aumentó en que por ciento sobre una semana? Redondea su respuesta al más cercano centésimo parte de un por ciento.

Completa.

1.   Z-Globe sent a submarine to the bottom of the Pacific Ocean off the coast of California. Its mission was to collect some rocks for radiometric dating. It was in a fairly shallow place and the water was only343m deep. It was well within the submarine's safe operating depth. In fact the submarine was capable of diving to a depth of1,900m. At what percent of the safe operating depth was the sub operating during its mission off the coast of California? Round your answer to the nearest tenth of a percent.

2.   A soil sample from Mr. Bloop's farm was sent to the county agriculture department for analysis. It was found to consist of23% sand,24.5% silt,28.8% clay,8% gravel and the rest was humus. What percent of the sample was humus?

Key #2

Completa.

1.   Supongamos que una cierta fuerza ejerce una presión de15Pascales sobre un área cuadrada. Si la fuerza se aumentó lentamente hasta que la presión es139% de la presión, ¿que es la nueva presión?

2.   Sean's soapbox racer completed a half-mile course in3minutos y10seconds. Hunter's car completed the same course in2minutos y48seconds. The average speed of Hunter's car was what percent of Sean's? Round your answer to the nearest hundredth of a percent.

Completa.

1.   Jennifer is concentrating a sample by distillation. She started with140ml de una solución que era aproximadamene0.01% inorganic salts. After several hours of distillation the amount of inorganics salts hasn't changed, but the volume had been decreased to54ml. What percent of the solution after distillation is inorganic salts? Round your answer to the nearest hundredth of a percent.

2.   A sample of clay is found in Mongolia that contains aluminum, silicon, hydrogen, magnesium, iron, and oxygen. The amount of iron is equal to the amount of aluminum. If the clay is21% silicon,19% hydrogen,9% magnesium and20% oxygen, what is the percent iron?

Completa.

1.   According to the statistics, the Megalopolis lacrosse team scores34% of their goals in the first half of play and the rest during the second half. Thus, it seems that the coach's opinion that they are a "second half team" is correct. If they scored12goals in the first half this year, about how many did they score in the second half?

2.   Coach Jones stresses the importance of free throws during basketball practice. The day before each game, everyone on the team shoots20free throws, and he charts their progress as the season goes by. If Cameron made7out of 20 on the first day of practice, and most recently he made12out of 20, by what percent has his free throw completion rate changed? Round your answer to the nearest hundredth of a percent.

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Answer Key

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Sample
This is only a sample worksheet.

suscriptores de edHelper - Cree un imprimible nuevo Clave también incluye las preguntas La hoja de respuestas sólo da las respuestas Sin clave de respuestas Not a subscriber?  Sign up now for the subscriber materials!

Porcentajes Matemáticas Middle School Math Porcentajes

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This worksheet still contains English.
edHelper is working on the translation