Posted by **lucy** on Tuesday, May 10, 2011 at 4:30pm.

What is the formula for finding these??

1. 30 % of 90

2. 70 is 10 % of what?

3. 4/10 of 30

4. change 2/8 to a percent

Please help me with these formulas! Thanks!

- math -
**Ms. Sue**, Tuesday, May 10, 2011 at 4:45pm
The word "of" means multiply.

Change the percent to a decimal.

30% * 90 = 0.3 * 90 = 27

0.1 x = 70

x = 70/0.1 = 700

I'll be glad to check your answers for the other problems.

- math -
**lucy**, Tuesday, May 10, 2011 at 5:08pm
so.. 3. 4/10 of 30=

4/10 x 30/1=12

and 4. 2/8 to % would be 8 into 2 which equals .25= 25 %

- math -
**Ms. Sue**, Tuesday, May 10, 2011 at 5:12pm
Both are right! :-)

## Answer This Question

## Related Questions

- Chemistry - 1.What is the formula for finding percent water hydrates? 2. And ...
- Math Help ASAP PLEASE!!! - Youâ€™ve probably heard of Albert Einstein's formula ...
- Calc - I need help finding the correct formula after finding the doubling time ...
- math - How do you solve percent of change? My problem says identify the percent ...
- Adam Help - Write the formulas for silicon dioxide. Note: it says formulas SiO2 ...
- Math - The Kelvin scale is an absolute temperature scale threat can be used to ...
- Math - The table shows how many hours Catalina spent babysitting during the ...
- Chemistry - I need some help with some of these questions: The action of ...
- Chemistry - I need some help with some of these questions: The action of ...
- chemistry - 1.to calculate the percent by massof an element in a known compound...

More Related Questions