# Free Online Math Help

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Solved Example
Question: The sum of thrice the smaller is four times the larger, is 44. If one number is 4 more than another. What are the two numbers?
Solution:
Let x be the smaller number.

Then the larger number is 4 more = x + 4

The problem states,

3x + 4(x + 4) = 44

=> 3x + 4x + 16 = 44

=> 7x = 44 - 16

=> 7x = 28

=> x = 4

=> Smaller number = 4

and Larger number = 4 + 4 = 8

## Online Math Help Free

Online free math help can be found for any grade and level of math and students can easily keep up with simple and easy to understand explanations. Topics like algebra and calculus which students find especially difficult are made much easier with math help online for free. Math solvers have a lot of practice problems and worksheets which students can work out on their own. Online math help for free offers students several advantages. Accessible from anywhere and at any time, online help is giving students a lot of flexibility in terms of timing and place.

## Solved Examples

Question 1: Find the greatest common factor of 24, 40 and 60.
Solution:
Write the prime factorization of each given number

Factors of 24 = 2 × 2 × 2 × 3

Factors of 40 = 2 × 2 × 2 × 5

Factors of 60 = 2 × 2 × 3 × 5

=> GFC = 2 * 2 = 4

Question 2: If the area of a circle is 25 pi square feet, find its circumference.
Solution:
The area of circle is given by,

A = 25 pi square feet

We know, Area = pi × r × r.

and circumference = 2 x pi x r

Therefore,

pi × r × r = 25 pi

r × r = 25

=> r = 5 feet   ...................(1)

The circumference is,

2 × pi × r = 2 × pi × 5 = 10 pi feet

using equation (1)

=> Circumference of circle = 10 pi feet.

Question 3: A car moves at the speed of 81 km/hr. What is the speed of the car in meters per second?

Solution:
Speed of car = 81 km/hr

1 km = 1000 m

1 hr = 3600 sec

=> 81 km/hr = 81 x $\frac{1000}{3600}$ m/sec

= 81 x $\frac{5}{9}$ m/sec

= 45 m/sec

=> Speed of car = 45 m/sec.