Learn a Fact: 2 x 9

1
2
x  7
2
8
x  1
3
2
x  6
4
5
x  1
5
7
x  0
6
0
x  9
7
2
x  4
8
3
x  2
9
1
x  6
10
0
x  8
11
9
x  1
12
7
x  1
13
1
x  1
14
5
x  2
15
1
x  4
16
2
x  8
17
2
x  2
18
2
x  1
19
1
x  3
20
2
x  9

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2

x9


18

9

x2


18

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2
X 8
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