It's increasing by...
10 + 10 =20
20 + 20 =40
40 + 30 = 70
70 + 40 = 110
110 + 50 = ....
Each number increases by 10 more than the previous.
Hope that makes sense.
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40 (+20, -10, +30 ,-20)
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, . . .
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, . . .5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, . . .
160 220 290
The GCF of 10, 20, and 40 is 10.