MATH FORMULA
BASE X HEIGHT DIVIDED BY 2
AREA OF A TRIANGLE
$39 is 78% of what amount?
50
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.
make a decimal
7/10
.70
convert to improper fraction
2 3/4
11/4
2(L) + 2(W)
perimeter of a rectangle
$156 is 39% of what amount?
400
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
make a decimal
2/7
.285
convert to improper fraction
8 3/5
43/5
R X T
DISTANCE
$494 is 95% of what amount?
520
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
make a decimal
4/5
.80
convert to improper fraction
8 6/7
62/7
(P) x (R) x (T)
interest
$268 is 67% of what amount?
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
make a decimal
41/74
.55
convert to improper fraction
11 7/13
150/13
(L) x (W)
area of a a rectangle or square
$365 is 73% of what amount?
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
make a decimal
99/100
.99
convert to improper fraction
4 3/4
19/4