1, the order of mixed operation of decimal multiplication is the same as that of mixed operation of integer multiplication. Multiply first, then divide, then add and subtract, and those with brackets are counted in brackets first, and then counted out. ?
2. The law of integer multiplication is also applicable to fractional multiplication; Algorithms can make some calculations simple. ?
3. If the fractional multiplication formula contains band scores, the band scores should be converted into false scores before calculation; In the process of multiplication, the divisor is to cross out two divisible numbers in the numerator and denominator, and then write the divisor above and below them respectively. (After reduction, the numerator and denominator can no longer contain common factors, so the calculated result is the simplest score).
4. Fraction and integer multiplication: the product of numerator and integer multiplication is numerator, and the denominator remains unchanged (both integer and denominator are fractions).
5. For any number, its reciprocal is; The reciprocal of a nonzero integer is; The reciprocal of the score is the reciprocal of the real score greater than1; The reciprocal of the false score is less than or equal to1; The reciprocal of the score is less than 1.
Definition of decimal multiplication and division:
Fractional multiplication refers to the numerator of a fraction multiplied by the numerator and the denominator multiplied by the denominator. What can be subtracted must be subtracted first, and the numerator cannot be multiplied by the denominator. When doing the first step, we should think about whether the numerator of one number and the denominator of another number can be reduced.
Fractional division (except 0) is the calculation method of multiplying the dividend by the reciprocal of the divisor to get the result. Fractional multiplication and division is calculated by multiplication and division and reciprocal. Fractional multiplication and division requires the provision of points that can be reduced (simplified).