An integer can be divisible by another integer, which is a multiple of another integer. For example, 15 can be divisible by 3 or 5, so 15 is a multiple of 3 and 5. The quotient obtained by dividing one number by another. For example, a÷b=c, that is, A is a multiple of B, for example, A÷B=C, it can be said that A is C times that of B.
A number has countless multiples, which means that the set of multiples of a number is infinite. Note: you can't call a number a multiple alone, you can only say who is a multiple of who. Definition: The common multiple of two or more integers is called their common multiple. The least common multiple of two or more integers is called their least common multiple.
If the single digit of an integer is truncated, and then the single digit is multiplied by 4 to the remainder, if the sum is a multiple of 13, then the original number can be divisible by 13. If the difference is too large or it is difficult to see whether it is a multiple of 13 in mental arithmetic, it is necessary to carry out the above-mentioned process of truncation, multiplication, addition and difference test until a clear judgment can be made.
If the single digits of an integer are truncated, five times the single digits are subtracted from the remaining numbers. If the difference is a multiple of 17, the original number can be divisible by 17. If the difference is too big or the mental arithmetic is not good, is it a multiple of 17
The benefits of learning mathematics:
1. Mathematics can cultivate people's integrity and honesty. Mathematics pays the most attention to convincing people by reasoning, and only believes in the results of logical reasoning.
Mathematics can cultivate people's tenacity and courage. The great math educator Paulia said: "Difficulties and problems belong to the same concept. If there is no difficulty, there will be no problem.
3. Mathematics can cultivate people's overall consciousness. To solve mathematical problems, we must comprehensively consider the problems from the known to the conclusion and grasp the interrelationships of all aspects. Mathematics teaching can cultivate students to consider problems comprehensively from the overall situation.
Mathematics can cultivate people's good character. The better a person's math study, the more flexible his thinking. In this case, his enthusiasm and enthusiasm are very high, and he is good at expressing his ideas and methods, so that his communication skills will be tempered and his self-confidence will be gradually enhanced.