Squaring a 2digit number ending in 8
1.Choose a 2-digit number ending in 8.
2.The last digit of the answer is always 4:_________4
3.Multiply the first digit by 6 and add 6 (keep the carry):____X _
4.Multiply the first digit by the next consecutive number and add the carry: the product is the first two digits: XX_________.
Example:
1.If the number is 78:
2.The last digit of the answer is 4:__________4
3.Multiply the first digit (7) by 6 and add 6 (keep the carry): 7x 6 = 42. 42 + 6 = 48; the next digit of the answer is 8 (keep carry 4):________8 4
4.Multiply the first digit (7) by the next number (8) and add the carry (4): 7 x 8 = 56, 56 + 4 = 60 (the first two digits): 6 0_________
5.So 78 x 78 = 6084.
See the pattern?
1.For 38 x 38
2.The last digit of the answer is 4:__________4
3.Multiply the first digit (3) by 6 and add 6 (keep the carry): 3x6 = 18, 18 + 6 = 24; the next digit of the answer is 4 (keep carry 2):________4 4
4.Multiply the first digit (3) by the next number (4) and add the carry (2): 3 x 4 = 12, 12 + 2 = 14 (the first two digits): 14__________
5.So 38 x38 = 1444
(Learn the pattern, practice other examples, and you will be a whiz at giving these squares.)
Notes
Vedic Maths - Notes
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