Mental Percents

Presentation

•

Mathematics

•

6th - 8th Grade

•

Hard

Joseph Anderson

FREE Resource

5 Slides • 6 Questions

Mental Math Percents

Think of the the fraction equivalent.

25%=1/4
33 1/3% = 1/3
20% = 1/5
50%=1/2
10% = 1/10
1%=1/100

Examples

Multiple Choice

What is 25% of 80?

Fill in the Blanks

$33\ \frac{1}{3}\%\ of\ 75$

Type answer...

Use the "trick of zeros"

20% of 70 = 2 x 7 = 14
60% of 30 =6 x 3 = 18
90% of 10 =9 x 1=9
30% of 5000=1500

Multiple Choice

Find 60% of 30

Fill in the Blanks

Find 80% of 20

Type answer...

To find 1% of a number, divide by 100 (move the decimal two places to the left)

1% of 90 = 90/100=0.9
1% of 5 = 5/100=0.05
1% of 300=300/100=3

Multiple Choice

Find 1% of 45

4.5

0.45

0.045

Fill in the Blanks

Find 1% of 89

Type answer...

Mental Math Percents

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