Multiplication by 13
The rule is multiply each digit by 3 and then at the right neighbour.
Illustration 2. 7625 × 13
1. 07625 × 13
2. (5×3) + 0 = 15
3. (2×3) + 5 = 11 +1 = 12
4. (6×3) + 2 = 20 +1 = 21
5. (7×3) + 6 = 27 + 2 = 29
6. (0×3) + 7 = 7 +2 = 9
7. Now take all the unit digit from the bottom 99125
Answer : 99125
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