Four-to-six-to-fifty pairs is an accurate counting method, in which "four" means less than five, "six" means more than five, and "five" means the rounded mantissa. Look at the one in front, the odd ones don't even get in. For example, 1.25 keeps one decimal place, because 2 is an even number, so it is 1.2. Another example is 1.35, because 3 is an odd number, it is 1.4.
From the statistical point of view, "four families, six families and 50% pairs" is more scientific than "rounding", which makes the rounded results bigger and smaller and more uniform, instead of inputting them every Friday like rounding, resulting in a large number of results.
For example:1.15+1.25+1.35+1.45 = 5.2. If one decimal place is rounded, the calculation is as follows:
1.2+ 1.3+ 1.4+ 1.5=5.4
According to the calculation of "four houses in six and fifty pairs",1.2+1.2+1.4+0.4 = 5.2, the rounding result can better reflect the actual result.
Tips for learning mathematics
1, you should be good at thinking when learning mathematics, and the answers you come up with are far more impressive than those others say.
2. Prepare well before class, so that we can better digest and absorb the unknown knowledge points in math class.
3, the mathematical formula must be memorized, and it must be deduced and can be deduced.
4. The most basic thing to learn mathematics well is to master the knowledge points of textbooks and exercises after class.
5. 80% of the scores in mathematics come from the basic knowledge, and 20% of the scores are difficult, so it is not difficult to test 120.
6. Mathematics needs to be done by heart. It is difficult for impetuous people to learn math well. Doing the problem in a down-to-earth manner is the last word.