Prime numbers are any number that cannot be divided evenly by another number except for one and itself.
19. Circle any number that is
a orime number in ne list below:
1
2
3
4
5
6
7 17 27 37 47
8
9
10 20
11
12 22 32 42
13
14
15
16
18
19
21 31 41
23
24
25 35 45
26
28
29
30
33
34 44
36 46
38 48
39 49
40 50
43
51 61 71
52 62 72 82 92
53 63 73 83 93
54 64 74 84 94
55 65 75 85 95
56 66 76 86 96
57 67 77 87 97
58 68 78 88 98
59
60 70 80 90 100
69 79 89 99
81 91
Here are a few tricks by which vou can tell whether a number is divisible: Divided by 2: all even numbers. Divided by 3: if the sum of the digits is divisible by 3 Divided by 5: number ends with 0 or 5 Divided by 6: even and rule for 3 works. Divided by 9: if sum of digits is divisible by 9. Divided by 11: if a 3-digit number has the first and last digit sum to be the middle digit.
Using the number tricks above, fill in the blanks.
20. 22,245 is divisible by
and
21. 473 is divisible by
22. 6561 is divisible by
and
23. 792 is divisible by 2, 3,
,and
Find the Lowest Common Multiple and Greatest Common Factor of each. Label. Icm, gcf
24. 35 and 21
25. 18 and 42
26. 21 and 54
27. 3, 12, and 20
