There are two main reasons for pupils' calculation errors in knowledge. First, the concept is unclear and the calculation is unclear. Mathematical knowledge is based on a series of mathematical concepts. For example, the calculation rules of pen addition are composed of a series of mathematical concepts such as "number", "unit" and "full ten". If the concept is unclear, it can't be calculated correctly according to mathematical knowledge such as laws, laws, properties and formulas.
Second, the oral calculation is not familiar, and the pen calculation is not accurate. The addition and subtraction of numbers within 20 and the good division and oral calculation of numbers within 100 are the basis of multi-digit four operations, as well as fractional four operations and decimal four operations. Any four operations of integer, fraction and decimal can be decomposed into some basic oral calculation problems. If you are not familiar with oral calculation, mistakes will inevitably occur in calculation.
Calculation, in mathematical terms, is a kind of thinking process that transforms a single or complex input value into a single or complex result. The definition of calculation can be used in many ways, from a fairly precise definition, such as "arithmetic" with various algorithms, to a more abstract definition, such as "calculation of strategy" or "calculation of the success probability of two people in a game".
Calculations in mathematics include addition, subtraction, multiplication, division, multiplication, root and so on. Addition, subtraction, multiplication and division are called four operations. The way to determine how to establish a relationship between people is also the result of a calculation, but this calculation is difficult to be accurate, unpredictable or even clearly defined. This definition of calculation with infinite possibilities is completely different from the mathematical arithmetic mentioned above.
Application of calculation:
Astronomical research institutions need computers to analyze space pulses and star position movements; Biologists need computers to simulate protein's folding process and discover the mystery of the genome. Pharmacists want to develop drugs to treat cancer or various bacteria and viruses, and medical scientists are developing new ways to prevent aging.
Mathematicians hope to calculate the largest prime number and more accurate value of π; Economists should use computers to analyze and calculate the development direction of an enterprise, a city and a country under the consideration of tens of thousands of factors, so as to carry out macro-control; Industry needs to accurately calculate the best scheme of material, energy, processing and time allocation in the production process.