• How to multiply fractions?

    Igor Kallaur
    Igor Kallaur
    January 15, 2013
    11123
    How to multiply fractions?

    The question of how to multiply fractions is asked not only by the student. Sometimes parents, in a fit of desire to help their child, try to remember information on this issue. And this is not always easy. After all, school is long over, and this information is rarely used in everyday life. Increasingly, we use calculators and other equipment. However, this is simply unacceptable for the child.

    How to multiply ordinary fractions?

    So, let's begin. First of all, let’s see how to multiply ordinary fractions. Ordinary fractions are fractions of the form 2/4, 3/7, etc., where 2, 3 are the numerator, and 4 and 7, respectively, the denominator. In order to multiply these two fractions between them, it is enough to multiply the numerators and denominators between them. Those. 2 multiplied by 3, and 4 by 7. Thus, we get the fraction 6/28, Reducing which by 2 we got 3/14.

    How to multiply ordinary by mixed?

    The situation with multiplying ordinary fraction by mixed one is a bit more complicated. To perform this operation, you need to figure out what is a mixed fraction.In addition to the fraction itself, a mixed fraction also has an integral part.for example 13/7. To multiply this fraction, it must be reduced to a standard form. To do this, multiply the denominator by the integer part and add the numerator to this number. The resulting number will be the numerator. The denominator remains the same.

    Example: (7 * 1 + 3) / 7. Fraction called the wrong.

    After this multiplication occurs according to the above principle of multiplying an ordinary fraction by an ordinary fraction.

    How to multiply number by fraction?

    If the question arises how to multiply a number by a fraction, it is enough to multiply this number by the numerator of the fraction, leaving the denominator the same as it was.

    How to multiply decimals?

    Decimal fractions are type 0.1 fractions; 0.123, etc. To multiply these fractions you need to multiply the numbers after the comma. Then we put a comma before the resulting number. The number of digits to be separated by a comma equals the sum of the digits after the decimal point in both original fractions.

    Example: 0.12 * 0.01 =? Multiply 12 by 1, we get 12. Then we count the number of digits after the decimal point in both fractions. In our case, there are 4 of them. Then, before 12, separate 4 characters with a comma.If we get the number of characters separated by a comma less than the number of characters in the resulting number, then it is put before the number 0. Thus, we get the number 0.0012.

    Summing up, I note that it is impossible to remember everything, but understanding the basic principles of the multiplication of fractions, you can not only do it yourself, but also help your child in this matter.


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