How to fold the crushes

Your child brought homework from school, and you do not know how to solve it? Then this mini lesson for you!

1

How to fold decimal fractions

Decimal fractions are more convenient to fold in the column. To make the decrease in decimal fractions, you must adhere to one simple rule:

• The discharge must be under the discharge, the comma died.

As you see on the example, entire units are in each other, the discharge of the tenths and hundredths is in each other. Now we have numbers, not paying attention to the comma. What to do with a comma? The comma is transferred to the place where there was a discharge.

2

Addition of fractions with equal denominators

To accumulate with a common denominator, you need to save the denominator without changing, finding the sum of the numerals and get a fraction that will be a total amount.

3

Addition of fractions with different denominators by finding a common multiple

The first thing to pay attention is to the denominators. Danger people are different, whether one thing is shared, whether simple numbers are. To begin with, we need to bring to one common denominator, there are several ways for this:

• 1/3 + 3/4 \u003d 13/12, To solve this example, we need to find the smallest common multiple number (NOC), which will be divided into 2 denominator. To indicate the smallest multiple number A and B - NOC (A; B). In this example, NOC (3; 4) \u003d 12. Check: 12: 3 \u003d 4; 12: 4 \u003d 3.
• I turn the multipliers and make the addition of the numbers obtained, we get 13/12 - the wrong fraction.

• In order to translate the wrong fraction in the correct, divide the numerator to the denominator, we obtain an integer 1, the residue 1 is a numerator and 12 - denominator.

4

Addition of fractions by multiplication cross on a cross

For the folding of fractions with different denominators there is another way according to the "Cross on the Cross" formula. This is a guaranteed way to level the denominators, for this you need numerators to multiply with an denomoter of one fraction and back. If you are only at the initial stage of learning fractions, then this method is the easiest and accurate, how to get a sure result when adding fractions with different denominators.