write the multiplication table of 9 and find its follows
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9 x 1 = 09
9 x 2 = 18
9 x 3 = 27
9 x 4 = 36
9 x 5 = 45
9 x 6 = 54
9 x 7 = 63
9 x 8 = 72
9 x 9 = 81
9 x 10 = 90
So you hold down your 5th finger for 5 × 9, your 7th finger for 7 × 9, and so on.
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