N Ú M 3 R 0 2
| 3 | x | 37 | = | 111 |
| 6 | x | 37 | = | 222 |
| 9 | x | 37 | = | 333 |
| 12 | x | 37 | = | 444 |
| 15 | x | 37 | = | 555 |
| 18 | x | 37 | = | 666 |
| 21 | x | 37 | = | 777 |
| 24 | x | 37 | = | 888 |
| 27 | x | 37 | = | 999 |
111.111.111 x 111.111.111 =
= 12.345.678.987.654.321
Trapézio
1 x
9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
1234 x 9 + 5 = 11111
12345 x 9 + 6 = 111111
123456 x 9 + 7 = 1111111
1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
Outro trapézio
1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
E mais
outro
0 x 9 + 8 = 8
9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888
987654321 x 9 - 1 = 8888888888
9876543210 x 9 - 2 = 88888888888