a) Create a multiplication or division problem using the fact shown and any other numbers you need.
A person’s heart beats about 42 100 000 times a year.
b) Solve the problem and explain your solution.
Answers
Answer:
Create a multiplication or division problem using the fact shown and any other numbers you need.
A person’s heart beats about 42 100 000 times a year.
b) Solve the problem and explain your solution.
Answer:
Percent literally means “per 100,” or “parts per hundred.” When we write 40%, this is equivalent to the fraction
40
100
or the decimal 0.40. Notice that 80 out of 200 and 10 out of 25 are also 40%, since
80
200
=
10
25
=
40
100
.
EXAMPLE 1
243 people out of 400 state that they like dogs. What percent is this?
Solution
243
400
=
0.6075
=
60.75
100
. This is 60.75%.
Notice that the percent can be found from the equivalent decimal by moving the decimal point two places to the right.
EXAMPLE 2
Write each as a percent:
1
4
0.02
2.35
Solutions
1
4
=
0.25
= 25%
0.02 = 2%
2.35 = 235%
PERCENTS
If we have a part that is some percent of a whole, then
percent
=
part
whole
, or equivalently,
part
⋅
whole
=
percent
.
To do the calculations, we write the percent as a decimal.