Real Numbers Worksheet (Page 3 of 4) in pdf

Real Numbers Worksheet Page 3

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Subtract the exponents on 10 and divide the other parts of the numbers separately.

3.4

10 .

Ex 5:

Part 6: Percents

A percent is a ratio of a number to 100. A percent can be expressed using the percent symbol %.

Ex. 6: 10 percent or 10% are both the same, and stand for the ratio 10:100.

A percent is equivalent to a fraction with denominator 100.

Ex 7: 5% of something = 5/100 of that thing.

Percent and hundredths are basically equivalent. This makes conversion between percent and

decimals very easy.

To convert from a decimal to a percent, just move the decimal 2 places to the right. For example,

0.15 = 15 hundredths = 15%.

Ex 8: 0.0006 = 0.06%.

Converting from percent to decimal form is similar, only you move the decimal point 2 places to

the left. You must also be sure, before doing this, that the percentage itself is expressed in

decimal form, without fractions.

Ex 37: Express 3% in decimal form. Moving the decimal 2 to the left (and adding in 0's to the

left of the 3 as place holders,) we get 0.03.

Ex 9:

Percent

Fraction

Decimal

34.6

346

173

34.6%

0.346

100

1000

500

Because it is very easy to switch between a decimal and a percent, estimating a percent is as easy

as estimating a fraction as a decimal, and converting to a percent by multiplying by 100

Real Numbers Worksheet Page 3