-9
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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
18
18. Let me show you why: If I have 1 set of 9, I have 9 . . . . . . . . . 2 sets of 9 makes 18 . . . . . . . . . . . . . . . . . .