Sum-difference-product Flashcards
1
Q
2+4
A
6
2
Q
2+5
A
7
3
Q
2+6
A
8
4
Q
2+7
A
9
5
Q
2+3
A
5
6
Q
2+8
A
10
7
Q
2+9
A
11
8
Q
3+3
A
6
9
Q
3+4
A
7
10
Q
3+5
A
8
11
Q
3+6
A
9
12
Q
3+7
A
10
13
Q
3+8
A
11
14
Q
3+9
A
12
15
Q
4+4
A
8
16
Q
4+5
A
9
17
Q
4+6
A
10
18
Q
2+2
A
4
19
Q
4+7
A
11
20
Q
4+8
A
12
21
Q
4+9
A
13
22
Q
5+5
A
10
23
Q
5+6
A
11
24
Q
5+7
A
12
25
5+8
13
26
5+9
14
27
6+6
12
28
6+7
13
29
6+8
14
30
6+9
15
31
7+7
14
32
7+8
15
33
7+9
16
34
8+8
16
35
8+9
17
36
9+9
18
37
2x2
4
38
2x3
6
39
2x4
8
40
2x5
10
41
2x6
12
42
2x7
14
43
2x8
16
44
2x9
18
45
3x3
9
46
3x4
12
47
3x5
15
48
3x6
18
49
3x7
21
50
3x8
24
51
3x9
27
52
4x4
16
53
4x5
20
54
4x6
24
55
4x7
28
56
4x8
32
57
4x9
36
58
5x5
25
59
5x6
30
60
5x7
35
61
5x8
40
62
5x9
45
63
6x6
36
64
6x7
42
65
6x8
48
66
6x9
54
67
7x7
49
68
7x8
56
69
7x9
63
70
8x8
64
71
8x9
72
72
9x9
81
73
GCF/LCM Formula
LCM=PxQ/GCF
74
Prime numbers 0-10
2-3-5-7
75
Prime numbers 11-20
11-13-17-19
76
Prime numbers 20-40
23-29-31-37
77
2²
4
78
3²
9
79
4²
16
80
5²
25
81
6²
36
82
7²
49
83
8²
64
84
9²
81
85
11²
121
86
12²
144
87
13²
169
88
2³
8
89
3³
27
90
4³
64
91
5³
125
92
6³
216
93
7³
343
94
8³
512
95
9³
729
96
Divisible by 4
If last two digits are divisible by 4
97
Divisible by 3 or 9
If the sum of the digits is divisible by 3 or 9
98
Divisible by 6
If divisible by both 2 and 3
99
Prime numbers 40-60
41-43-47-53-59
100
GCF
Take lower factors and multiply. Only if they are in both.
2³x3³x5
2^5x5³
=2³x5
101
LCM
12=3 x 2²
75=3 x 5²
LCM=3 x 2² x 5²
