Normalization can be divided into positive normalization and anti-normalization. No matter whether it is normalization or denormalization, we must first find a "single quantity" when solving.
In the process of solving the normalization problem, the number of a unit (that is, a single quantity) is calculated first, and then several single quantities are calculated by multiplication according to the requirements of the topic, that is, induction, which is the solution rule of the normalization problem, while the solution rule of the inverse normalization problem is to find the single quantity first, and then calculate how many single quantities are included in the total by division.
Classification of standardization problems:
1, go straight to one
In some practical problems, it is often necessary to calculate the number of a unit first, and then find the required problem.
2. Return to normalization (reverse normalization)
For example: "A car drives for 4 hours 120km. According to this calculation, how many hours does 180km take? " First, how many kilometers does 1 hour drive on average, and then how many hours does 180 km drive on average? The formula is:180 ÷ (120 ÷ 4) =180 ÷ 30 = 6 (hours).
3, twice as much as one
For example, "two tractors cultivated 32 hectares in four days. According to this calculation, how many hectares of cultivated land have been cultivated by five tractors in seven days? " Firstly, how many hectares were cultivated by 1 tractor in 1 day, and then how many hectares were cultivated by five tractors in 7 days. The formula is: 32÷2÷4×5×7= 140 (hectare).