If the product of 3x4 is a three-digit number, what is the minimum number?
The smallest three digits are 100.
100÷4=25。
That is to say, at least 25 or more, multiplied by 4, the product can be a three-digit number.
Therefore, in 3x4 port, the minimum value should be 3.
Multiplication operation property
(1) Multiply several numbers by the product of a number, so that any factor in the product can be multiplied by this number and then multiplied by other numbers. For example: (25× 3× 9 )× 4 = 25× 4× 3× 9 = 2700.
(2) Multiply the difference between two numbers by a number, so that the minuend and the minuend are multiplied by this number respectively, and then subtract the products. For example: (137-125) × 8 =137× 8-125× 8 = 96.
Multiplication meaning
A shortcut to add up the same numbers. The result of its operation is called product, and "X" is the symbol of multiplication. From the philosophical point of view, multiplication is the result of qualitative change caused by additive quantity. The multiplication of integers (including negative numbers), rational numbers (fractions) and real numbers is a systematic summary of this basic definition.
Multiplication can also be seen as calculating the objects arranged in a rectangle (integer) or finding the area of a rectangle with a given side length. The area of the rectangle does not depend on which side is measured first, which shows the exchange property. The product of two measured values is a new type of measurement, for example, multiplying the length of two sides of a rectangle to get its area, which is the theme of size analysis.
Clever calculation
Multiplication is one of the basic operations in mathematics. Suppose that A times B equals C, which means ab = c or AB = C. In ancient China, multiplication was carried out by several pieces. There are three layers in calculating multiplication: the upper layer is the multiplicand, the middle layer is the product and the lower layer is the multiplier.
Multiply the multiplicand by the largest bit of the multiplier, remove the calculation of this bit after multiplication, multiply it by the second bit, and add the numbers on the corresponding bits of the two products until the multiplication is over.