Learn a Fact: 2 x 9

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

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2

x9


18

9

x2


18

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2
X 8
16
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X 0
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