6th grade math
posted by Alex .
Hi.. i'm a little confused on using proprtion equations to solve percent problem. can you check the following? Is there a different way to solve?
equation: is(part)/of(whatnumber)= %/100
1. What is 94% of 43?
x/43 = 94/100
100x = 43*94 (cross multiply)
100x = 4042
x = 4042/100
x = 40.42
2. 63 is what percent of 84?
63/84 = x/100
84x = 63*100
84x = 6300
x = 6300/84
x = 75%
3. 5% of what is 3.4?
3.4/x = 5/100
5x = 100*3.4
5x = 340
x = 340/8
x = 68
4. What is 5% of 28?
x/28 = 5/100
100x = 28*5
100x = 140
x = 140/100
x = 1.4
5. 15% of what is 6.3?
6.3/x = 15/100
15x = 100*6.3
15x = 630
x = 630/15
x = 42
6. 3.8 is what percent of 76?
3.8/76 = x/100
76x = 100*3.8
76x = 380
x = 380/76
x = 5
7. Find 64% of 48.
x/48 = 64/100
100x = 64*48
100x = 3072
x = 3072/100
x = 30.72
8. What percent of 90 is 6?
6/90 = x/100
90x = 6*100
90x = 600
x = 600/9
x = 66.67% ?
9. 105 is 5% of what number?
105/x = 5/100
5x = 105*100
5x = 10500
x = 10500/5
x = 2100 ?
10. What percent of 69 is 138?
138/69 = x/100
69x = 138*100
69x = 13800
x = 13800/69
x = 200
Thanks

Change percent to decimal and multiply.
1. .94 * 43 = 40.42
8. 6/90 = .066667 (convert to percentage by multiplying by 100)
9. 105/.05 = 2100
Your answers seem right, but you can check again by using decimals.
Respond to this Question
Similar Questions

chemistry ugg!
what is the age of a rock whose Argon 40 / Potassium 40 ratio is 1.55? 
Substitution MethodPlz help
Use the Substitution method to solve the system of equations. x + y = 4 x  y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=4 (y+2) + y = 4 solve for y. Then, x= y+2 i don't get it.How … 
How do I do this.?(Math.)
Use the Substitution method to solve the system of equations. y  2x = 5 3y  x = 5 Solve one of the equations for x or y. Let's solve the first one for y: y  2x = 5 y = 2x  5 Now let's substitute 2x  5 for y in the second equation … 
math
determine the equation of the line in y=mx+b form that passes through 1. (8,1) & (9, 2) 2. (3,7) & (5, 9) 3, (4,0) & (4,6) Part B ) For each equation Rewreite the y=mx+b equation in general form Ax+by+c=0 where A is positive b … 
math
Can someone help me figure this out. The difference of two numbers is 80. The second is 8 less than 5 times the first. What are the two numbers? 
algebra
if you have the sign of > or < does this also mean = ? 
Algebra
Hey! I like math,but this year I'm doing algebra 1 and am not doing so well. I understand the lessons,but then the next day I learn a new way to solve a different problem and confuse the old way with this new way. So on tests,I know … 
Math for Steve
1. Identify the part, whole, and percent in the following statement: Find 15% of 750. a. part = 750, whole = n, percent = 15 b. part = 15, whole = 750, percent = p c. part = n, whole = 750, percent = 15 d. none of these 2. Write a … 
7th grade math Ms. Sue please
1. Identify the part, whole, and percent in the following statement: Find 15% of 750. (1 point) part = 750, whole = n, percent = 15 part = 15, whole = 750, percent = p part = n, whole = 750, percent = 15 none of these 2. Write a percent … 
Math  Another question to check, sorry... =/
7. 72 is what percent of 480? Write and solve an equation to solve the problem. Step 1. First, I will write out the equation. part = percent x whole Step 2. Now, fill in the partsâ€¦ 72 = p x 480 Step 3. I will simply divide 72 by