1、 104
36
48
Seventy-eight
4、42
Seventy-eight
165
5988
2037
p2 1
5. Number
6. There are two others.
7、5
1
four
eight
8. Use 3* even numbers for12, 24, 36.
5、 15、25
p22
9、( 1)×(2)√(3)√
10, odd number: 435, even number: 340, multiple of 2: 350, multiple of 5: 345, multiple of 3: 435, all multiples of 2, multiple of 3: 354.
p23
There is only one factor: 1.
There is only one factor and himself: 2, 3, 5, 7, 1 1, 13, 17, 19.
There are more than two factors: 4,6,8,9, 10, 12, 14, 15, 16,18,20.
Do it: prime numbers: 17, 29, 37.
Plural numbers: 22, 35, 87, 93, 96
p24
There are 25 prime numbers: 2,3,5,7, 1 1, 13, 17,19,23,29,31,37,4.
Everything except 1 is a composite number.