M3.3.8 For the adult
Percentages
What does 35% mean, and what is 15% of 80?
What this chapter teaches
A percentage is a fraction out of 100. It is changed into a fraction by writing it over 100 and simplifying, and into a decimal by dividing by 100. To find a percentage of an amount, build it from 10%, 5% and 1%. To write one amount as a percentage of another, make the bottom of the fraction 100.
Three questions to ask
There is no one right wording. Listen for the idea.
- What does 35% mean, and how do you write it as a decimal?
- How can you find 15% of 80 without a calculator?
- How do you write 18 out of 50 as a percentage?
After the chapter, the learner can
- Write 35% as a fraction and as a decimal
- Find 15% of 80 by finding 10% and 5%
- Write one amount as a percentage of another
What they copy into their notebook
Percent means out of 100. 35% = 35/100 = 0.35. To find 15%, find 10% by dividing by 10, then 5% as half of that, and add.