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Basic Math

Percents, fractions, and decimals- Home
- Pre-Algebra
- Decimals

Still Confused?

Try reviewing these fundamentals first.

Basic Math

Percents, fractions, and decimalsStill Confused?

Try reviewing these fundamentals first.

Basic Math

Percents, fractions, and decimalsNope, I got it.

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Get Started Now- Lesson: 1a2:17
- Lesson: 1b3:12
- Lesson: 1c2:45
- Lesson: 1d3:48
- Lesson: 22:17

In this section, we will try to estimate the percent of a number without using a calculator. The trick is to breakdown the percent into smaller percent first. These smaller percentages are easier for mental calculation.

Basic concepts: Percents, fractions, and decimals,

- 1.Evaluate without using a calculator. Then, check your answers with a calculator.a)15% of 40b)320% of 600c)17.5% of 20d)$20\frac{1}{4}$% of 50
- 2.The total rain precipitation of last summer was 350 mm. If it increased by $12\frac{1}{2}$% this summer, what was the rain precipitation this summer?

We have over 870 practice questions in Pre-Algebra for you to master.

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