Percentages
Convert 20% into the following
Decimal:
Fraction:
Decimal: 0.20
Fraction: 20/100
multiply the following ( use a paper )
1)2.5*6
2)17.8*4
1)15.0
2)71.2
Sami has 2 boxes of strawberries and 7 strawberries leftover. How many strawberries does he have if each box had:
5
9
p
5*2+7
9*2+7
2p+73x-6=-21
x=___x=-5
3*-5-6=-21
-15-6=-21
The formula for the area of a triangle
What is B/2 * H
A class has 20 students, eleven are girls, and nine are boys. What percentage of the class are girls and what percentage are boys.
Girls: 11/20 *5 *5
55/100——————>55% are girls.
Boys: 9/20 *5 *5
45/100——————>45% are boys.
Add or subtract the following:
587.30-78.36
657.79+365.32
78.6+345.8-73.2
587.30-78.36=508.94
657.79+365.32=1,023.11
78.6+345.8-73.2=351.2
Product notation, simplify the following:
1)x+x+x+x-y-x
2)7x+x-3x+x3
1)3x-y
2)5x+x3
The length of a rectangle is 5cm and its width is 7cm. What is the area?
5*7=35cm2
The formula for the area of a trapezoid
What is B1+B2/2 * H
What is:
28% of 8
56% of 87
28/100*8/1=2.24
28% of 8=2.24
56/100*87/1=48.72
56% of 87=48.72
Collect the following like terms.
1)2x+3m-5x
2)x+x+x-2x+7y
3)5z-3x+7y-2z
1)-3x+3m
2)1x+7y
3)3z-3x+7y
A 30% discount is given to a phone with the price of $900, however it is followed with a 5% tax. What is the discounted price and final price?
30/100 * 900/1
30/1 * 9/1=$270 discount
900-270=$630 discounted price
5/100 * 630/1
5/10 * 63/1=$31.5 tax
630+31.5=$661.5 final price
The discounted price was $630 and the final price was $661.5.
Divide
8.97/0.3
then multiply the answer by:
7
8.97/0.3——————>89.7/3
89.7/3=29.9
29.9*7=209.3If x=-8 solve
1)2x
2)x/4+7
3)x2-9
1)-16
2)5
3)55
(1*4-7+x)/-3 +2=1
x=____
-3+x/-3 +2(-2)=1(-2)
-3+x/-3(*-3)=-1(*-3)
-3(+3)+x=3(+3)
x=6
A trapezium has a height of 2ft and has a base of 8in and 6in, and has a side length of 7in. What is the perimeter and area. (Hint: Each foot is 12 inches long)
Perimeter: 8+6+7+7=28in
Area:8+6/2 * 7
7*7=49