First, think carefully and sit in the right position.
1. If A is divisible by B, then A is B's () and B is A's ().
The factor of 2 and 24 is ().
3. Multiples of 8 from small to capital 6 ().
4. The smallest multiple of a number is a, and its factor is ().
5. Among the three numbers of 26, 12 and 13, () is a multiple of (), () is a factor of (), and the common factor of () and () is only 1.
6. The factor of a number is 36, this number is (), and the minimum multiple of this number is ().
7. Among natural numbers, the smallest number that is both odd and prime is (), () is both odd and composite, () is both even and prime, and () is neither prime nor composite.
Second, carefully scrutinize and distinguish right from wrong.
When 1 and 18÷9=2, we will say that 18 is a multiple and 9 is a factor. ( )
2. 10÷2.5=4, so 10 can be divisible by 2.5. ( )
3. 1 is a factor of all natural numbers. ( )
The multiple of a number must be greater than the factor of this number. ( )
5. The factor of 12 is only 2,3,4,6,12. ()
Third, compare repeatedly and choose carefully.
1, the following four groups of numbers have the relationship between factors and multiples ().
A.45 and 15 B. 1 and 13 C. 29 and 14.5 D. 6 and 8.
2, the following statement is wrong ()
A. A number has countless factors. A number has countless multiples.
C. the factor of a number. A multiple of a number
3. In the following four numbers, () is a multiple of 24 and () is a multiple of 6.
A.24 B. 1 C. 6 D. 12
4. In the figure below, () is a multiple of 5, including a factor of 3.
A. 15 B. 45 C. 50 D. 24
Reference answer:
I. 1, factor, multiple
2、 1,2,3,6,9, 18; 1,2,3,4,6,8, 12,24
3、8, 16,24,32,40,48
4. A.
5、26; 13; 13; 26; 12; 13
6、36; 1,2,3,4,6,9, 12, 18,36; 36
7、3; 9; 2; 1
Two. 1, × 2 ,× 3, √ 4, × 5, ×
Third, 1, AB2, AD3, ABCDACD4, AB.