1.2 × 2.3 = 2.76
0. 125 × 0.88 = 0. 1 1
1. 1 × 8.56 = 9.4 16
0.45 × 1.26 = 0.567
Vertical, please see the picture:
Question 2: How to list the vertical forms of decimal multiplication? Mental retardation is a disease, which refers to the development disorder of the central nervous system caused by various reasons during the embryonic period or after birth, and is characterized by mental retardation clinically. Mental retardation generally refers to the failure to reach the normal level in the process of intellectual development. Scholars all over the world use different terms to describe mental retardation, such as congenital stupidity, congenital dementia, mental retardation, mental retardation, mental retardation, mental retardation, mental retardation, mental retardation, mental retardation, mental retardation, mental retardation, mental retardation and so on.
Understanding the concept of mental retardation is not only of great theoretical significance, but also of great practical significance. The theoretical significance of the definition of mental retardation lies in revealing the laws and characteristics of children's abnormal mental development. Its practical significance is more important. It can not only distinguish between normal and abnormal intelligence of children, but also determine what kind of education children receive: children with normal intelligence should receive education from ordinary schools, while children with mental retardation should enter educational institutions specially set up for them.
Mental retardation has become a common disease in human nervous system. It is reported that there are about 6 million children and adults with mental retardation in the United States, accounting for about 3% of the total population of the United States. The prevalence of mental retardation in the Soviet Union accounts for 1-3%. Every year, 654.38+300 million infants with brain defects are born in North America.
According to the severity of mental retardation, it can be divided into several grades. Early in the United States, mental retardation was divided into three types: slow (IQ 50-69), stupid (IQ 25-49) and * * * (IQ below 25). The current education in the United States can be divided into three types: educatable, trainable and supervised. In China, according to mental retardation, mental retardation is usually divided into three types: * * type, stupid type and slow type.
* * * The mental retardation is the most serious. * * * Children can't talk, can't count, and don't know how to avoid danger. * * * Children can't live independently, and most of them die in infancy.
Stupid children are seriously mentally retarded and can learn to speak, but they can't speak clearly. After training, these children can take care of their daily lives, learn some simple mechanical operations, and live to adulthood under the supervision of adults.
Mental retardation is mild. Although these children can go to school, their academic performance is poor, and those who are slow can live independently and engage in simple labor.
Question 3: How to illustrate decimal multiplication vertically, as shown above.
Non-zero number alignment (usually right-handed alignment) is calculated according to the calculation method of integer multiplication. Finally, the multiplier * * *, how many decimal places there are, count a few decimal places from right to left, and use 0 to account for the shortage.
Question 4: Decimal multiplication uses column vertical calculation. How to multiply the column vertical by an integer?
Question 5: How to make decimal multiplication vertical? Hello, it should be like this: for example, 12.5×20.2.
12.5
×20.2
-
24 1.0
Hope to adopt, thank you!