Introduction to Percents.

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Presentation transcript:

Introduction to Percents

Decide whether each question is reasonable. Does it make Sense or Nonsense Decide whether each question is reasonable. Does it make sense? Or is it nonsense? If you are not sure, that’s OK… maybe it depends on the situation.

Mr. Bragg says he is right 100% of the time. Is this possible? Yes? No? or Maybe? Mr. Bragg says he is right 100% of the time. Is this possible?

Cindy spends 95% of her allowance on candy. Is this sensible? Yes? No? or Maybe? Cindy spends 95% of her allowance on candy. Is this sensible?

Yes? No? or Maybe? The "Never Miss“ basketball team made 10% of the baskets they tried. Should they change their name?

Yes? No? or Maybe? Sarah missed 10 problems on her science test. Is her percentage high enough to earn an A?

Yes? No? or Maybe? Joe loaned Jeff $1.00. He said that the interest would be 75% each day. Is this a good deal for Joe?

Reflection In your math notebook, write down one or two key ideas about percents that came up during the “Sense or Nonsense” activity.

Definition: What is Percent? A percent is a ratio of a number compared to 100. Percent comes from the Latin per centum, or “per hundred.”

Definition: What is Percent? A number such as 32% can be written as “32 per hundred” or the ratio 32 . 100

A percent is a “part to whole” ratio comparison. Definition: What is Percent? A percent is a “part to whole” ratio comparison.

What percent is red? How do you see it? Visual: What percent is red? How do you see it?

Example #1: Sloths sleep an average of 12 hours per day. What percent of the day do they sleep?

Example #2: There are 35 students in Ms. Vandever’s class. Forty percent of the students are girls. How many of the students are girls?

Example #3: In a recent election, 72 of the 150 sixth graders voted in the class election. What percent of the sixth graders voted?