Sum-difference-product Flashcards

1
Q

2+4

A

6

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2
Q

2+5

A

7

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3
Q

2+6

A

8

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4
Q

2+7

A

9

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5
Q

2+3

A

5

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6
Q

2+8

A

10

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7
Q

2+9

A

11

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8
Q

3+3

A

6

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9
Q

3+4

A

7

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10
Q

3+5

A

8

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11
Q

3+6

A

9

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12
Q

3+7

A

10

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13
Q

3+8

A

11

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14
Q

3+9

A

12

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15
Q

4+4

A

8

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16
Q

4+5

A

9

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17
Q

4+6

A

10

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18
Q

2+2

A

4

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19
Q

4+7

A

11

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20
Q

4+8

A

12

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21
Q

4+9

A

13

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22
Q

5+5

A

10

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23
Q

5+6

A

11

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24
Q

5+7

A

12

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25
Q

5+8

A

13

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26
Q

5+9

A

14

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27
Q

6+6

A

12

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28
Q

6+7

A

13

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29
Q

6+8

A

14

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30
Q

6+9

A

15

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31
Q

7+7

A

14

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32
Q

7+8

A

15

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33
Q

7+9

A

16

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34
Q

8+8

A

16

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35
Q

8+9

A

17

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36
Q

9+9

A

18

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37
Q

2x2

A

4

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38
Q

2x3

A

6

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39
Q

2x4

A

8

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40
Q

2x5

A

10

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41
Q

2x6

A

12

42
Q

2x7

A

14

43
Q

2x8

A

16

44
Q

2x9

A

18

45
Q

3x3

A

9

46
Q

3x4

A

12

47
Q

3x5

A

15

48
Q

3x6

A

18

49
Q

3x7

A

21

50
Q

3x8

A

24

51
Q

3x9

A

27

52
Q

4x4

A

16

53
Q

4x5

A

20

54
Q

4x6

A

24

55
Q

4x7

A

28

56
Q

4x8

A

32

57
Q

4x9

A

36

58
Q

5x5

A

25

59
Q

5x6

A

30

60
Q

5x7

A

35

61
Q

5x8

A

40

62
Q

5x9

A

45

63
Q

6x6

A

36

64
Q

6x7

A

42

65
Q

6x8

A

48

66
Q

6x9

A

54

67
Q

7x7

A

49

68
Q

7x8

A

56

69
Q

7x9

A

63

70
Q

8x8

A

64

71
Q

8x9

A

72

72
Q

9x9

A

81

73
Q

GCF/LCM Formula

A

LCM=PxQ/GCF

74
Q

Prime numbers 0-10

A

2-3-5-7

75
Q

Prime numbers 11-20

A

11-13-17-19

76
Q

Prime numbers 20-40

A

23-29-31-37

77
Q

A

4

78
Q

A

9

79
Q

A

16

80
Q

A

25

81
Q

A

36

82
Q

A

49

83
Q

A

64

84
Q

A

81

85
Q

11²

A

121

86
Q

12²

A

144

87
Q

13²

A

169

88
Q

A

8

89
Q

A

27

90
Q

A

64

91
Q

A

125

92
Q

A

216

93
Q

A

343

94
Q

A

512

95
Q

A

729

96
Q

Divisible by 4

A

If last two digits are divisible by 4

97
Q

Divisible by 3 or 9

A

If the sum of the digits is divisible by 3 or 9

98
Q

Divisible by 6

A

If divisible by both 2 and 3

99
Q

Prime numbers 40-60

A

41-43-47-53-59

100
Q

GCF

A

Take lower factors and multiply. Only if they are in both.
2³x3³x5
2^5x5³
=2³x5

101
Q

LCM

A

12=3 x 2²
75=3 x 5²
LCM=3 x 2² x 5²