Squaring numbers in the 200s
1.Choose a number in the 200s (practice with numbers under 210, then progress to larger ones).
2.The first digit of the square is 4: 4____________
3.The next two digits will be 4 times the last 2 digits: _ X X_________
4.The last two places will be the square of the last digit:___________XX
Example:
1.If the number to be squared is 206:
2.The first digit is 4: 4________
3.The next two digits are 4 times the last digit: 4x6 = 24:_24__
4.Square the last digit: 6x6 = 36:___________36
5.So 206 x 206 = 42436.
For larger numbers work right to left
1.Square the last two digits (keep the carry):__________XX
2.4 times the last two digits + carry: _ X X________
3.Square the first digit + carry: X _
See the pattern?
1.If the number to be squared is 225:
2.Square last two digits (keep carry): 25x25 = 625 (keep 6):__________2 5
3.4 times the last two digits + carry: 4x25 = 100; 100+6 = 106 (keep 1): _ 0 6 _ _
4.Square the first digit + carry: 2x2 = 4; 4+1 = 5: 5____________
5.So 225 x 225 = 50625.
Notes
Vedic Maths - Notes
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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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23. Squaring a 2 digit number ending in 3
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25. Digital Sums For Multiplication By Eleven
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29. Multiplying two selected 3 digit numbers middle digit 0
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30. Squaring a 2digit number ending in 8
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31. Vertically and Crosswise To find 26 Multiplied by 31 in One Line we need to look at a Pattern
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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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37. 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. Squaring a 2 digit number ending in 9
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43. This little math trick will show you whether a number is divisible by four or not
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45. Multiplication of two numbers around 100 is even easier than you could ever imagine
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46. How to multiply 123 and 321 in one go
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47. Multiplying two 2 digit numbers difference of 2
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48. Squaring a 2 digit number ending in 1
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49. Squaring a 2 digit number ending in 6
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50. Multiplying two 2 digit numbers difference of 1
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