Multiplying two 2 digit numbers same 1st digit
1.Select two 2-digit numbers with the same first digit.
2.Multiply their second digits (keep the carry).__________X
3.Multiply the sum of the second digits by the first digit. add the carry (keep the carry).______________X
4.Multiply the first digits (add the carry). XX___________
Example:
1. If the first number is 42r choose 45 as the second number (any 2-digit number with first digit 4).
2. Multiply the last digits: 2x5 = 10 (keep carry) ________0
3. Multiply the sum of the 2nd digits by the first: 5 + 2 = 7; 7 x 4 = 28; 28 + 1 = 29 (keep cany)____9 _
4. Multiply the first digits (add the carry) 4x4= 16; 16 + 2= 18 18______
5. So 42 x 45 = 1890.
See the pattern?
1.If the first number is 62, choose 67 as the second number (any 2-digit number with first digit 6).
2.Multiply the last digits: 2x7 = 14 (keep carry) ______4
3.Multiply the sum of the 2nd digits by the first (add carry): 2 + 7 = 9; 6 x 9 = 54; 54 + 1 = 55 (keep cany) _ 5 _
4.Multiply the first digits (add the carry) 6x6 = 36; 36 + 5 = 41 4 1
5.So 62 x 67 = 4154.
Notes
Vedic Maths - Notes
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