Question

Of the 78 teenagers of the youth camp and 63% have birthdays in spring about how many teenagers have birthdays in spring

Answer 1

Answer about 49.

Explanation:

Step 1. To model the situation in mathematical terms, express

63

%

as a fraction.

63

%

⇒

0.63

⇒

63

100

Step 2. To find

63

%

of the

78

teenagers, multiply

78

by

63

100

.

78

×

63

100

Step 3. Solve.

=

78

39

×

63

100

50

=

39

×

63

50

=

49.14

≈

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

49

i

teenagers

a

a

∣

∣

−−−−−−−−−−−−−−−

Answer 2

about 49%

We can convert 63% directly to a decimal:

63% = 0.63

Then, doing the calculation by hand or with a calculator, we find

63% of 78 = 0.63 x 78 = 49.14

So the final answer is

63% of 78=49.14

You can round the decimal, if you're looking for a whole number, to about 49%.