You will need

- calculator;
- paper;
- pencil.

Instruction

1

First, remember that a fraction is merely a conditional record dividing one number by another. Unlike addition and multiplication, when dividing two integers is not always possible integer. Here and agreed to call these two "dividing" number of the fraction. The number that is divided is called the numerator and that is divided is the denominator.

2

To write the fraction, write the numerator first, then slide under that number with a horizontal line and below the line write the denominator. The horizontal line dividing the numerator and denominator is called fraction bar. Sometimes it is portrayed as a slash "/" or "per". In this case, the numerator is written to the left from the line and the denominator on the right. So, for example, the fraction "two-thirds" will be written as 2/3. For clarity, the numerator is usually written at the top of the line and the denominator is at the bottom, that is, instead of 2/3 can be found: ⅔.

3

If the numerator more than its denominator, then this "wrong" fraction is usually written in the form of "mixed" fractions. In order to receive a mixed improper fraction, simply divide the numerator by the denominator and write down the resulting quotient. Then place the remainder in the numerator of the fraction and write the fraction to the right of the quotient (the denominator do not touch). For example, 7/3 = 2⅓.

4

To add two fractions with the same denominator, simply add their numerators (the denominators do not touch). For example, 2/7 + 3/7 = (2+3)/7 = 5/7. Similarly produce and subtraction of two fractions (numerators at the same time deducted). For example, 6/7 – 2/7 = (6-2)/7 = 4/7.

5

To add two fractions with different denominators, multiply the numerator and denominator of the first fraction by the denominator of the second, and the numerator and denominator of the second fraction – by denominator of the first. In the end you get the sum of two fractions with the same denominators, addition of which is described in the previous paragraph.

For example, 3/4 + 2/3 = (3*3)/(4*3) + (2*4)/(3*4) = 9/12 + 8/12 = (9+8)/12 = 17/12 = 1 5/12.

For example, 3/4 + 2/3 = (3*3)/(4*3) + (2*4)/(3*4) = 9/12 + 8/12 = (9+8)/12 = 17/12 = 1 5/12.

6

If the denominators of the fractions have a common divisor, that is divided by the same number, then select as common denominator the smallest number divisible by the first and second denominator at the same time. For example, if the first denominator is 6 and the second 8 as a common denominator not take their work (48), and the number 24 which is split as at 6, and 8. The numerators of the fractions in this case are multiplied by the quotient of the common denominator by the denominator of each fraction. For example, for the denominator, 6 in this number will be 4 (24/6), and for the denominator 8 – 3 (24/8). More clearly, this process is visible in a specific example:

5/6 + 3/8 = (5*4)/24 + (3*3)/24 = 20/24 + 9/24 = 29/24 = 1 5/24.

Subtraction of fractions with different denominators is quite similar.

5/6 + 3/8 = (5*4)/24 + (3*3)/24 = 20/24 + 9/24 = 29/24 = 1 5/24.

Subtraction of fractions with different denominators is quite similar.

7

To multiply two fractions, multiply between their numerators and denominators.

For example, 2/3 * 4/5 = (2*4)/(3*5) = 8/15.

For example, 2/3 * 4/5 = (2*4)/(3*5) = 8/15.

8

To divide two fractions, multiply the first fraction by the inverted (reverse) the second fraction.

For example, 2/3 : 4/5 = 2/3 * 5/4 = 10/12.

For example, 2/3 : 4/5 = 2/3 * 5/4 = 10/12.

9

To reduce a fraction, divide its numerator and denominator by the same number. For example, the result of the previous example (10/12) can be written as 5/6:

10/12 = (10:2)/(12:2) = 5/6.

10/12 = (10:2)/(12:2) = 5/6.

# Advice 2 : How to learn to solve fractions

Fractions allow us to Express in different forms the exact value of. With fractions you can perform the same math operation and with whole numbers: addition, subtraction, multiplication, and division. To learn how to solve

**fractions**, it is necessary to remember about some of their features. They depend on the type**of shot**, the presence of an intact part that common denominator. Some arithmetic operation after performing require a reduction of the fractional part of the result.You will need

- calculator

Instruction

1

Look closely at these numbers. If some fractions have decimal and narvilene, it is sometimes easier to first perform operations on decimal, and then convert them into the wrong kind. Translate

- The transfer of the fractions in improper form:

- 1 2/3 + 2 ¾ = 5/3 + 11/4 = 20/12 + 33/12 = 53/12 = 4 5/12;

Summation of separate integral and fractional parts of terms:

- 1 2/3 + 2 ¾ = (1+2) + (2/3 + ¾ ) = 3 +(8/12 + 9/12) = 3 + 17/12 = 3 + 1 5/12 = 4 5/12.

**fraction**in the species initially recorded value after the decimal point in the numerator and putting a 10 in the denominator. If necessary, simplify the fraction by dividing the number above and below the line on one divider. Fraction, which is a part, lead to the wrong kind, multiplying it by the denominator and adding the result to the numerator. This value will become the new numerator**of the fraction**. To highlight a part of the original improper**fraction**, we must divide the numerator by the denominator. A result record to the left of the**fractions**. And the remainder becomes the new numerator, the denominator**of the fraction**is not changed. For fractions with integer part may perform actions separately, first for a and then for the decimal parts. For example, the sum of 1 2/3 and 2 ¾ can be calculated in two ways:- The transfer of the fractions in improper form:

- 1 2/3 + 2 ¾ = 5/3 + 11/4 = 20/12 + 33/12 = 53/12 = 4 5/12;

Summation of separate integral and fractional parts of terms:

- 1 2/3 + 2 ¾ = (1+2) + (2/3 + ¾ ) = 3 +(8/12 + 9/12) = 3 + 17/12 = 3 + 1 5/12 = 4 5/12.

2

For improper fractions with different values under the dash, find the common denominator. For example, 5/9 and 7/12 common denominator will be 36. To do this, the numerator and denominator of the first

**fraction**should be multiplied by 4 (it will 28/36) and second on 3 (get 15/36). Can now perform the necessary calculations.3

If you are going to calculate the sum or difference of fractions, first record found the common denominator under the line. Perform the required actions in between the numerators and write the result above the line of the new

**fraction**. Thus, the new numerator will be the difference or the sum of the numerators of the original fractions.4

To calculate the product of the fractions multiply the numerators of the fractions and write the result in place of the numerator of the final

**fraction**. Do the same for the denominators. When dividing one**fraction**to another write down one fraction, and then multiply the numerator by the denominator of the second. The denominator of the first**fraction**is multiplied respectively to the numerator of the second. Thus there is a kind of revolution of the second**fraction**(divisor). The resulting fraction will consist of the results of multiplying the numerators and denominators of both fractions. It is easy to learn how to solve**fractions**recorded in the condition in the form of "four-storied"**fraction**. If a trait is shared by the two**fractions**, rewrite them using the delimiter ":" and continue with the usual division.5

To obtain the final result, reduce the fraction, divide the numerator and the denominator by a single integer, the largest possible in this case. While above and below this line must be integers.

Note

Do not perform arithmetic operations with fractions, the denominators are different. Choose a number that when multiplied by it, the numerator and denominator of each fraction in the result, the denominators of both fractions were equal.

Useful advice

When writing fractional numbers the numerator is written above the line. This value is referred to as the numerator of the fraction. Below the line is written to the divisor, or denominator, of the fraction. For example, half a kilogram of rice as a fraction written in the following way: 1 ½ kg of rice. If the denominator is equal to 10, such a fraction is called a decimal. The numerator (dividend) is written to the right of the integer part using a comma: 1.5 kg of rice. For computational convenience, such a fraction can always be written in an incorrect form: 1 2/10 kg of potatoes. To simplify, you can reduce the values of the numerator and denominator by dividing them into a single integer. In this example, perhaps dividing by 2. The result is a 1 1/5 kg of potatoes. Make sure that the numbers that you are going to perform arithmetic operations, presented in the same form.