The formula of average division: total number ÷ number of copies = number of copies. Formula including division: total number ÷ number of copies = number of copies. Dividend = divisor × quotient+remainder. Divider = (dividend-remainder) ÷ quotient. Quotient = (dividend-remainder) divider. Remainder = dividend divided by quotient.

The unit conversion formula is: 1 m = 10 decimeter 1m= 10dm. 1 decimeter =10cm1DM =10cm. 1cm = 10mm 1cm = 10mm。 1m = 100cm 1m = 100cm。 1 decimeter = 100 mm 1 decimeter = 100 mm/m =1000 mm 1m = 1000 mm. 1 km = 1 000m1km =1000m.

Summary of mathematical laws in grade two

In the formula without brackets, there are addition and subtraction, multiplication and division. Multiply and divide first, then add and subtract. If there is only addition and subtraction or only multiplication and division, it should be calculated from left to right. Formulas in brackets should be calculated first.

Pay attention when reading: no matter how many zeros there are at the end, there are one or more zeros in the middle, and only one zero is read. Note when writing numbers: there is nothing on any number, just fill in a zero placeholder on that number.

It should be noted that the number with more digits is greater than the number with less digits. When the number of digits is the same, the number with the highest digit is greater than the number with the highest digit. When the highest digit is the same, the ratio of one digit to another digit in descending order, which digit is larger, indicates that the number is larger.