PERCENT WITH A CALCULATOR

PROBLEMS

Do the problem yourself first!

1.   a)  Every percent problem involves how many numbers?  Three.

1.   b)  What are those numbers called?  The Amount, the Percent,
1.   b)  and the Base.

1.   c)  How can we always recognize the Base?  It follows "of."

2.  In each of the following, which number is the Amount, which is the
2.  Percent, and which is the Base?  If the number is unknown, write an
2.  question mark (?).  (There is nothing to calculate.)

 Amount Percent Base a)  How much is 50% of 14? ? 50% 14 b)  7 is 50% of 14. 7 50% 14 c)  50% of 12 is 6. 6 50% 12 d)  What number is 75% of 12? ? 75% 12 e)  12 is 75% of what number? 12 75% ? f)  12 is what percent of 75? 12 ? 75 g)  75% of what number is 12? 12 75% ? h)  What percent of 75 is 12? 12 ? 75

3.  The Three Rules.  To find the unknown number, multiply only to
3.  find the Amount.

3.  In the other two cases, divide.

4.  a)  How much is 37.5% of 96?   36

4.  b)  96 is 37.5% of how much?  256  Compare this operation with a).

4.  c)  \$13.50 is what percent of \$21.60?  62.5%

5.  Amount = Base × Percent.  Calculate each of the following.

5.  a)  37% of \$69.50.  \$25.72               b)  6.4% of \$219.  \$14.02

5.  c)  420% of \$3.97.  \$16.67               d)  .5% of \$1,243.00.  \$6.22

5.  e)  53.8% of \$63.20.   \$34.00            f)  7.89% of \$86.90.  \$6.86

6.  Base = Amount ÷ Percent.

6.  a)  \$89.50 is 26% of how much?  \$344.23

6  b)  14% of how much is \$78.50?  \$560.71

6.  c)  8.65% of how much is \$22.91?  \$264.86

6.  d)  \$63.40 is 43.1% of how much?  \$147.10

6.  e)  7.1% of how much is \$13.95?  \$196.48

7.  Percent = Amount ÷ Base.  Round off to one decimal place.

7.  a)  28 is what percent of 41?  68.3%

7.  b)  58 is what percent of 105?  55.2%

7.  c)  What percent of 348 is 107?  30.7%

7.  d)  What percent of \$23.50 is \$164.50   700%

7.  e)  \$3.80 is what percent of \$12?  31.7%

7.  f)  What percent of \$16.50 is \$25.16?  152.5%

8.  Calculate the following.  To report a Percent, round off to one
8.  decimal digit.

8.  a)  How much is 24.7% of \$89.50?  \$22.11

8.  b)  \$89.50 is 24.7% of how much?  \$362.35

8.  c)  \$37 is what percent of \$87?  42.5%

8  d)  Find 39.6% of \$28.60.  \$11.33

8.  e)  8.65% of how much is \$32.70?  \$378.03

8.  f)  \$121.50 is what percent of \$45?  270%

8.  g)  Find 52% of \$79.80.  \$41.50

8.  h)  What percent of \$90 is \$27?  30%

8.  i)  \$29.50 is 65.2% of how much?  \$45.25

9.  Sandra was charged \$31.15 for some supplies.  That included a 4% tax.
9.  What was the original price before the tax?  \$29.95

Continue on to the next Lesson.

or