When converting units, names are usually involved, and they also appear in this textbook. Numbers containing quantitative unit names are called names, such as 3m, 10kg, 3.8 yuan, etc. , are all names.

For example: 1 cent =0. 1 angle =0.0 1 yuan,1mm = 0.1cm = 0.001m.

Convert large units into small units by multiplication,1m =1x100 =100 cm.

Divide small units into large units by division, such as 1000g = 1000 divided by 1000= 1 kg.

Decimal multiplication and division calculation rules:

1, decimal multiplication calculation rules:

First, calculate the product according to the calculation rules of integer multiplication, and then look at the factor * * * and how many decimal places there are. Just count the numbers from the right side of the product and point to the decimal point. If the number of digits is not enough, use "0" to make it up.

2, decimal division calculation rules:

First, move the decimal point of the divisor to make it an integer, then move the decimal point of the divisor to the right by several digits (if there are not enough digits, add "0"), and then calculate according to the division rule that the divisor is an integer.