Multiplying two 2 digit numbers difference of 10
1.Choose a 2-digit number.
2.Select a number either 10 smaller or 10 larger.
3.Find the middle number of the two (the average).
4.Square this middle number (multiply it by itself).
5.Subtract 25 from this square.
Example:
1.If the first number is 36, choose 26 as the second number (10 smaller).
2.The middle number (the average) is 31.
3.Square this middle number: 31 x 31 = 961.(Remember how to square a 2-digit number ending in 1?)
4.Subtract 25 from this square: 961 - 25 = 936 (subtract mentally in steps: think 961 - 20 - 5 = 941 - 5 = 936).
5.So 36 x26 = 936.
See the pattern?
1.If the first number is 78, you might pick 88 as the second number (10 larger).
2.The middle number (the average) is 83.
3.Square this middle number: 83 x 83 = 6889. (Remember how to square a 2-digit number ending in 3?)
4.Subtract 25 from this square: 6889 - 25 = 6864 (subtract mentally in steps: think 6889 - 20 - 5 = 6869 - 5 = 6864).
5.So 78 x 88 = 6864.
Remember to subtract in easy steps and pick your number to get an easy square. With practice you will be a whiz at getting these products.
Notes
Vedic Maths - Notes
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22. Multiplying two selected 3 digit numbers middle digit 1
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24. Squaring a 2 digit number ending in 5
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29. Digital Sums For Multiplication By Eleven
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31. The Squaring of Numbers Ending in 5
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34. Multiplying two selected 3 digit numbers middle digit 0
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41. Squaring a 2 digit number ending in 1
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46. Multiplying two 2 digit numbers difference of 2
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