# Learn Math

**About us**

## iPracticeMath (http://www.iPracticeMath.com/) makes Math fun and easy for kids.

We provide the learning topics on basic math, algebra and calculus with

math practice

in a format of multiple-choice and Maths Worksheet to practice more!

**Mission**

## Our step by step process to practice math using Multiple Choice question as well as

## Online Worksheet aims to provide the motivation to learn Math in Fun manner.

**Description**

### It is geared for kids from Grade 1 to 12

### and provides extensive practice tests, for addition, subtraction, multiplication, algebra geometry etc.

### iPracticeMath (http://www.iPracticeMath.com/) makes Math fun and easy for kids.

### Our step by step process to practice math using Multiple Choice question as well as Online Worksheet aims to provide the motivation to learn Math in Fun manner.

# Math topics:

## Basic Math

## Algebra

## Calculus

## Decimal

## Fraction

## Consumer Math

**Learn More**

**What is profit and loss?**

The amount of money you pay for something is: cost price.

The amount of money you get for sell something is: selling price.

Selling price is greater than the cost price: you get a profit.

**Profit = selling price – Cost price**

Selling price is less than the cost price: It gives loss.

**Loss = Cost price – Selling price**

**How to find Ratio?**

**Ratio: to compare two quantities by division.**

The quotient of that division is called a ‘ratio’.

The colon ‘:’ is used to express a ratio.

The ratio of 7 to 9 is written as ‘7:9’

The ratio of 7 to 9 is read as ‘7 is to 9’.

The ratio is written as ‘a:b’ and is read as ‘a is to b’.

**Let us understand this better by example:**

In a cricket match, Max scored 80 and Sam scored 40 runs.

Let us see how many times Max’s score is that of Sam’s.

Just divide Max’s score by Sam’s

Max’s score/ Sam’s score= 80/40 = 2/1= 2:1

Thus,we find here that, **Max’s score is 2 times Sam’s score. More**

How to calculate the volume of a cylinder?

Volume of cylinder = area of base × height

**Example: **The radius of the base of a cylinder is given 28 cm and its height is 20 cm.

Find the volume of this cylinder.

Here,

Radius r =28cm

Height h = 20 cm

= 22/7× 28× 28× 20

= 22 × 4 × 28× 20

= 49280 cu cm

**Example: **

**The height of a cylindrical tank is 1 m**

**and its diameter is 84 cm.**

**How many liters of water can it hold? **

(1000 cu cm = 1 liter)

Here, r = 84/2= 42 cm

H = 1 m = 100 cm

**Volume of tank = ?**

= 22/7× 42 × 42 × 100

= 22 × 6 × 42 × 100

= 554400 cu cm

1000 cu cm = 1 liter

554400 cu cm = 554400 /1000 liters= 554.400 liters

**The tank will hold 554.400 liters of water. Learn more**

**Evaluate each expression**

**A) Rule 1: x ^{1}= x.**

Example:

(1/2)^{4} x (5/2)^{-2}

you see that when base raised to the positive power value;

x^{1 }= x.

So that,

(1/2)^{4} = ½ × ½ × ½ × ½

(5/2)^{-2}= 2/5 × 2/5(reciprocal of the number)

So that,

(1/2)^{4} x (5/2)^{-2}

= ½ × ½ × ½ × ½ × 2/5 × 2/5

Multiply numerators and multiply denominators

= 1/100

**B) **Rule 2:- When base raised to the negative power value; x^{-1 }= 1/ x^{1}

Any number with an exponent of 0 (except 0) automatically equals 1

**Example:-**

**(7/12) ^{0} ×4^{-1}**

(7/12)^{0} = 1 and

4^{-1}= 1/4

Therefore,

(7/12)^{0} ×4^{-1}

= 1 × 1/4

= 1/4 (Multiply numerators and multiply denominators)

Could I be involved in your program? I am 88 years old, more or less housebound and live in the Philippines. I taught Chemistry, Physics and Maths in schools and technical colleges in Britain until I was 55, then worked for three years for the Saudi Arabian government as supervisor for a group of hearing-impaired adolescents and came here in 1985 as a VSO volunteer to work in science education. About three years ago I had an attack of ARDS (Acute Respiratory Distress Syndrome) which prevented me from my ambulatory work with schools and colleges here and left me desperately in need of work. Not of income – my pensions suffice for my family’s needs. It seems to me that online work might be the solution to my problem, which is the reason for my contacting you.

John G. Gellner

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