MATH FORMULA

IS/OF/%/100

Halloween math

DECIMALS

FRACTIONS

100

BASE X HEIGHT DIVIDED BY 2

AREA OF A TRIANGLE

100

$39 is 78% of what amount?

50

100

Andy has a number of friends who like dressing as zombies for Halloween. Two years ago, four of his friends dressed as zombies. Last year, that number increased by ϐifty percent. This year, the number increased by one third over last year. How many of Andy’s friends are dressing as zombies this year?

Last year there were 6 zombies and this year there were 8.

100

make a decimal

7/10

.70

100

convert to improper fraction

2 3/4

11/4

200

2(L) + 2(W)

perimeter of a rectangle

200

$156 is 39% of what amount?

400

200

Many of Maria’s friends do not like molasses candies, so they trade them away for other Halloween loot. Since Maria likes molasses candy, she traded away six bags of chips, ten candy bars and a dozen suckers and got an average of three and a half molasses candies for each item. How many molasses candies did she get in trade?

98

200

make a decimal

2/7

.285

200

convert to improper fraction

8 3/5

43/5

300

R X T

DISTANCE

300

$494 is 95% of what amount?

520

300

If each bat eats eight hundred bugs per hour for ϐive hours per night, how many bugs would a colony of ϐifty bats eat in a week?

1,400,000

300

make a decimal

4/5

.80

300

convert to improper fraction

8 6/7

62/7

400

(P) x (R) x (T)

interest

400

$268 is 67% of what amount?

400

400

Ms. McAfee's bsep class is dressing up for Halloween. The students come to class in camouflage. Only 3 of 27 students did not wear their "costume."

What percentage of students were in "costume?"

70% in costume

30% out of costume

400

make a decimal

41/74

.55

400

convert to improper fraction

11 7/13

150/13

500

(L) x (W)

area of a a rectangle or square

500

$365 is 73% of what amount?

500

500

Rolando made two dozen ten inch cubes out of wood for the Halloween dance and put a strip of ϐluorescent tape on each edge of each cube, so they would light up under the black lights. How many feet of tape did he need for all the cubes?

There are 12 edges on a cube so each cube requires 10 × 12 = 120 inches of tape. For 24 cubes, 120 × 24 = 2880 inches of tape are needed which is 2880 ÷ 12 = 240 feet of tape. 5

500

make a decimal

99/100

.99

500

convert to improper fraction

4 3/4

19/4

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