1, decimal times integer has a factor that is decimal, so the product is generally decimal; Integer times integer product is an integer.

2. Decimal times integer. If there is a 0 at the end of the decimal part of the product, the 0 at the end can be removed according to the basic properties of the decimal, but the 0 at the end of the integer multiplication cannot be removed.

3. One is an integer multiplied by a decimal, and the other is a multiplication of two integers.

Integers are numbers like -3, -2,-1, 0, 1, 2,3, 10, excluding decimals and fractions.

Extended data:

Integer multiplication rules:

1) Starting from the right, multiply the first factor by the number on each bit of the second factor in turn, and the end of the number will be aligned with which bit of the second factor and on which bit of the factor; ?

2) Then add the multiplied numbers.

(Multiply with 0 at the end of an integer: you can multiply the number before 0 first, then see how many zeros are at the end of each factor, and add a few zeros at the end of the multiplied number. )?

Decimal multiplication rules:

1) Calculate the product according to the law of integer multiplication; ?

2) See how many decimal places a * * * factor has, and count the decimal places from the right of the number.

3) There is a 0 at the end of the decimal part of the number. Generally, 0 should be deleted.

Multiplication principle: If the dependent variable f is in direct proportion to the independent variable X 1, X2, X3...Xn, and each independent variable is qualitatively different, if any independent variable f is missing, it will lose its meaning, which is called multiplication.

In probability theory, the result of an event needs to be divided into n steps, the first step 1 includes M 1 different results, the second step includes M2 different results, …, and the n step includes Mn different results. Then this event may have n = m 1× m2× m3×…× Mn different results.