63x 97 = 37x 43 = 4 1x 35 = 36x 82 = 55x 98 = 72x 49 = 65x 30 = 74x 97 = 66x 10 = 35x 83 = 59x 64 = 92x 15 = 77x 2 1 = 12x 73 = 79x 12 = 77x 3 1 = 26x 38

Multiplication is one of the four basic operations in mathematics, which is used to calculate the product or multiple of two numbers. Multiplication is the process of multiplying two numbers to get a new number. The multiplicand is the number to be added repeatedly, and the multiplier is the number of times to be added repeatedly. The following will introduce the basic properties, symbolic representation and calculation method of multiplication.

Basic nature:

Method of substitution: a×b=b×a, that is, the order of multiplication does not affect the final result.

Law of association: (a×b)×c=a×(b×c), that is, the combination of multiplication does not affect the final result.

Distribution law: a×(b+c)=a×b+a×c, that is, the distribution property of multiplication versus addition.

Multiplicative classification

Unit number multiplication: for the multiplication of two unit numbers, you can multiply directly.

Multi-digit multiplication: Multi-digit multiplication adopts the method of "vertical multiplication", which multiplies the digits of two numbers respectively and then adds them to get the final result.

Decimal multiplication: Decimal multiplication is similar to integer multiplication. Align and multiply the decimal points, and then determine the final decimal point position. For example, 2.5×3.2=8.0.

Multiplication is widely used in daily life, such as calculating the total shopping price, calculating the area and volume. It is also the basis of advanced mathematical concepts and operations, such as algebra and equations. Understanding the basic properties and calculation methods of multiplication is helpful for accurate mathematical calculation and solving practical problems.