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Question #1

The following table shows numbers from 1 to 90. 

Answer the following questions regarding the highlighted cells. 
 
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
60 61 62 63 64 65 66 67 68 69
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90

The highlighted cells are multiples of one common number?


The pattern to move down from one highlighted cell to the next one is to add 10 and then add 1


The pattern to move up from one highlighted cell to the next one is to subtract 10 and then subtract 1



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