you need

- - mathematics textbook for the fifth grade.

Guide

1

So, let's look at the definition of parts of the whole.To do this, drawing a rectangle or square, the best on a sheet in the box.Divide the square on the cell, it will share equal parts of a whole.

Fractions are different, for example, common - 1/2, 3/7, 1/4, mixed - 1 ½, 2 ½

5 ¼, decimals - 0.25, 0.5, 0.7.

Fractions are different, for example, common - 1/2, 3/7, 1/4, mixed - 1 ½, 2 ½

5 ¼, decimals - 0.25, 0.5, 0.7.

2

All fractions depends on the basic properties of the fractions - fractions will not change if the numerator and denominator of the increase or decrease on the same number.Follow this rule, use the task of reducing fractions, solve the problem without a calculator.

3

Fractions can be converted from one form to another.For example, the fraction can be written as 25/100 0.25.A fraction can be reduced, turn ¼.It happens that the decimal is not necessary to cut.For example, 0.3 will remain 3/10 - this fraction is not reduced.But beware, not all ordinary fractions can be represented in decimal form.Do not find a decimal fraction of 1/3, 6/7, 1/7, and there are not a lot of translated fractions.

4

Try to find a decimal fraction of 3/20.To begin lay the denominator of this fraction into simple factors, such as 5 * 2 * 2.Record as an example: 3/20 = 3/20 * 5/5 = 15/100 = 0.15.

So, to find a decimal fraction, the denominator lay common fraction factorization, call the number of fives and deuces, select a single factor.Secure knowledge - get the decimal fraction of 3/50.Arrange the denominator factorization 50 = 2 * 5 * 5, then you need to submit a deuce in a fraction 2/2.3/50 * 2/2 = 6/100 = 0.06.

So, to find a decimal fraction, the denominator lay common fraction factorization, call the number of fives and deuces, select a single factor.Secure knowledge - get the decimal fraction of 3/50.Arrange the denominator factorization 50 = 2 * 5 * 5, then you need to submit a deuce in a fraction 2/2.3/50 * 2/2 = 6/100 = 0.06.

5

To find a decimal fraction of an ordinary share of its numerator by the denominator.For example, take the 5/8, Section 5 to 8, will get 0,625.Decimal can be infinite.For example, 18/7 in the exact decimal turn is impossible, because if 18 will be divided into an infinite number seven.

Note

Infinite fractions can be rounded, but this value is not exact.

Helpful hints If you have thought of a solution of example with mixed fractions - (3/4 + 0.5) * (1 1 / 5-0,7).Find decimals of ¾ -0,75 and from 1 1/5 -1.2, decide example, using decimals.