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Ratios
Mathématiques
Middle School Math
Ratios

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Name _____________________________

Date ___________________

Ratios
Complète.

1.	* Cette fiche est prête à l'emploi. Utilisez le lien en haut de la page pour une une page imprimable.

2.	Which is bigger,la moitiéof 30 orone-fourthof 72?

Complète.

3.	If venom A is two times as potent as venom B and venom C is3.2times as potent as venom B. How much more potent is venom C compared to venom A?

Benjamin analyzed some pollen grains found near a site that is thought to have been inhabited by humans many thousands of years ago. He found75examples of grass pollen,12examples of oak pollen, and15examples of unknown kinds of pollen. Let's assume his analysis was typical of the site and that another scientist could study the site and determine the exact same proportions of the three classes of pollen. Assuming this, if there were17,000pollen grains in the area of study, how many of them would be of an unknown type?

Key #2

Complète.

In a specimen of granite from the nearby mountain the ratio of feldspar to quartz is4to2by mass. If the mountain consists of 6 x 10⁸tons of granite, how much of it is feldspar. For this calculation you may assume that other minerals in the granite do not contribute significantly to its mass. Express your answer in scientific notation.

A soil sample from near a factory is analyzed to see if it is polluted. In one test,11g of soil was dried to remove water. After drying,72% of the original mass remained. An elemental analysis was performed and the soil was found to be28% carbon,24% oxygen,12% hydrogen, and the rest was ash. Ash contains minerals and other difficult to decompose matter. Assuming all the ash was the result of soil minerals, how many grams of minerals was in the original soil sample? Round your answer to the nearest hundredth.

Complète.

Danielle is trying a new fuel formula in her go-kart. In her first trial, fuel mixture A resulted in a maximum speed of24miles per hour on a flat smooth road. On the same road, mixture B resulted in a maximum speed of36miles per hour. Mixture B appears to increase the maximum speed of the go-kart by what factor? Express your answer as a ratio of speeds.

8.	A sealed steel container of methane gas is slowly heated. The temperature increases by5C every20minutes. If the initial temperature was30C, what will the initial to final temperature ratio (T_i/T_f) be after three hours?

Complète.

9.	The ratio of iron atoms to chromium atoms in a water sample from the treatment pond at Z-Globe is11to4. If there are158chromium atoms in a liter of the water, how many iron atoms are there in a liter? Round your answer to the nearest whole number if needed.

10.

For every five hundred thousand pounds of fertilizer manufactured at Bigearth, Inc., about420pounds are ruined by being accidentally left out in the rain. Last month,250pounds were ruined. Based on this information, estimate how many pounds of fertilizer were manufactured last month. Round your answer to the nearest whole number if needed.

Key #2

Complète.

11.	At Mr. Bloop's summer sports camp,1/8of the total participants came to learn about soccer. The rest came to learn about other sports. If140participants showed up, how many were not there to learn about soccer?

12.	The Littleville basketball team tries2field goals for every free throw. They makeun tiersof their attempts of either try. If they make16free throws in a game, how many field goals are they expected to make?

Answer Key

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Ratios
Mathématiques
Middle School Math
Ratios

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