Same tens digit, units add to 10
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Antyayor Daśake'pi (a sub-sutra): when the last digits add up to 10.
अन्त्ययोर्दशकेऽपि
Antyayor Daśake'pi
Meaning: When the last digits add up to 10
Example: 43 × 47
- Same tens digit (4); units 3 + 7 = 10.
- Tens digit × the next number: 4 × 5 = 20.
- Units × units: 3 × 7 = 21, written as two digits.
Answer: 2021
This works the same way as squaring numbers ending in 5, which is just the special case 5 + 5 = 10.