How to understand the chapter of sixth grade mathematics fraction multiplication

How to understand the chapter of sixth grade mathematics fraction multiplication

I'm teaching sixth grade mathematics, which is published by people's education press. Now it's up to the circle. Typing by mobile phone, let's talk about fractional multiplication briefly: first of all, we need to understand the meaning of integer multiplication, that is, simple operation for finding the sum of several identical addends, and the meaning of fractional multiplication is the same. In the unit of fractional multiplication, we will learn fractional multiplication by integer, fractional multiplication by fraction, reciprocal, etc, For example: 2 / 3 * 4 means to find out the sum of four 2 / 3 or the four times of 2 / 3. Fraction multiplies fraction. For example: 2 / 3 * 1 / 2 means to find out the 1 / 2 of 2 / 3. Pay attention to the difference between the meaning of 2 / 3 * 4 and 2 / 3 * 4. Next is the calculation method: 1. Fraction multiplies integer: 2 / 3 2 / 3 2 / 3 2 / 3 = 2 * 4 / 3 = 8 / 3, that is to say, 2 / 3 2 / 3 2 / 3 2 / 3 2 / 3 2 / 3 = 2 / 3 * 4 = 2 * 4 / 3 = 8 / 3, The above formula = 2 * 1 / 3 * 2 = 2 / 6 = 1 / 3 (fractional multiplication, which can be reduced first and then multiplied, in a word, it should be the simplest). The next problem is the application of fractions. The simplest problem is how many fractions of a number are, using multiplication, for example, 2kg of a packet of sugar, How many kilos is 3 / 5 of them? The formula: 2 * 3 / 5 = 6 / 5 (kilogram). In addition, there are some more complicated ones, which you can practice in books. Say the reciprocal, the two numbers whose product is 1 are reciprocal to each other. For example: 2 / 3 * 3 / 2 = 1