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3 is 1 third of nine. so for 1x9 just do 1x3 and times the answer by 3. 1x3=3 and 3x3=9 so 1x9=9. 2x3=6 and 6x3=18 so 9x2=18 and so on and so on.
The pattern is: 9, 18, 27, 36, 45, 54, 63, 72, 81, and 108.
The GCF is 9.
If you want to find the percentage of a number you just divide the smaller number by the bigger number: 9 / 18 = .50 = 50%
2/9 × 18 = (2×18)/9 = 36/9 = 4 Alternatively, cancelling as you go: 2/9 × 18 = (2×18)/9 = 2×(18/9) = 2×2 = 4