Multiplying two 2 digit numbers difference of 6
1.Choose a 2-digit number.
2.Select a number either 3 smaller or 3 larger.
3.Add 1 to the smaller number, then square.
4.Subtract one from the smaller number.
5.Add this to the square.
Example:
1.If the first number is 78, choose 72 as the second number.
2.The middle number (the average) is 75.
3.Square this middle number: 75 x 75 = 5625.Remember how to square a 2-digit number ending in 5?
4.Subtract 9 from this square: 5625 - 9 = 5616.
5.So 78 x 72 = 5616.
See the pattern?
1.If the first number is 31, choose 37 as the second number.
2.The middle number (the average) is 34.
3.Square this middle number: 34 x 34 = 1156.Remember how to square a 2-digit number ending in 4?
4.Subtract 9 from this square: 1156 - 9 = 1147.
5.So 31 x 37 = 1147.
Choose the second number that will give you the easier square, and use your square shortcuts. Practice.
Notes
Vedic Maths - Notes
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18. Multiplying two selected 3 digit numbers middle digit 1
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19. Likewise you can find out square of a number that is one less than the number whose square is known
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24. Squaring a 2 digit number ending in 3
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25. Digital Sums For Multiplication By Eleven
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29. Squaring a 2digit number ending in 8
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32. Multiplying two selected 3 digit numbers middle digit 0
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33. Convert Fahrenheit to Celsius and vice versa
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36. Multiplying two 2 digit numbers difference of 10
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38. Multiply any two numbers from 11 to 20 in your head Take 15 x 13
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39. Squaring a 2 digit number ending in 5
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40. The Squaring of Numbers Ending in 5
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41. Squaring a 2 digit number beginning with 9
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42. This little math trick will show you whether a number is divisible by four or not
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43. Squaring a 2 digit number ending in 9
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45. Squaring a 2 digit number ending in 1
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46. Multiplication of two numbers around 100 is even easier than you could ever imagine
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47. Multiplying two 2 digit numbers difference of 2
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48. How to multiply 123 and 321 in one go
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49. Squaring a 2 digit number ending in 6
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