Why does 1 x 9 = 9?

Because a single 9 is just 9.

That is, because 9 = 9.

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66
77
88
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110
121
132
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12
24
36
48
60
72
84
96
108
120
132
144
Keep practicing
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63
72
81
90
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108
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22
33
44
55
66
77
88
99
110
121
132
12
0
12
24
36
48
60
72
84
96
108
120
132
144

Why does 1 x 9 = 9?

Because a single 9 is just 9.

That is, because 9 = 9.

Keep practicing