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Qa04 hcf & lcm

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10 easy arithmetic tricks

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- 1. NISHANT ROHATGI 8 A ROLL NO . 24
- 2. Numbers below a base number ! 88 × 97 = 8536 We notice here that both numbers being multiplied are close to 100: 88 is 12 below 100, and 97 is 3 below it. -12 -3 88 × 97 = 85/36 The deficiencies (12 and 3) have been written above the numbers (on the flag – a sub-sutra), the minus signs indicating that the numbers are below 100. The answer 8536 is in two parts: 85 and 36. The 85 is found by taking one of the deficiencies from the other number. That is: 88 – 3 = 85 or 97 – 12 = 85 (whichever you like), and the 36 is simply the product of the deficiencies: 12 × 3 = 36. It could hardly be easier.
- 3. Splitting numbers 18 For eg. 18 18 * 7 9 2 We can write it as : 7 * 9 * 2 = 63 * 2 = 126
- 4. Multiplying by 4 For eg. 4 53 * 4 2 * 2 53 * 4 = 53 * 2 *2 Double of 53 = 106 Double of 106 = 212 Hence , 53 * 4 = 212
- 5. The sutras 8 By the Completion or Non-Completion 12 The Remainders by the Last Digit 13 The Ultimate and Twice the Penultimate 14 By One Less than the One Before 15 The Product of the Sum 16 All the Multipliers
- 6. Sutra 8, By the Completion or Non-Completion : The technique called completing the square’ for solving quadratic equations is an illustration of this Sutra. But the Vedic method extends to ‘completing the cubic’ and has many other applications
- 7. Sutra 11, Specific and General is useful for finding products and solving certain types of equation. It also applies when an average is used, as an average is a specific value representing a range of values. So to multiply 57×63 we may note that the average is 60 so we find 602 – 32 = 3600 – 9 =3591. Here the 3 which we square and subtract is the difference of eachnumber in the sum from the average (
- 8. Sutra 12, The Remainders By the Last Digit is useful in converting fractions to decimals. For example if you convert 17to a decimal by long division you will get the remainders 3, 2, 6, 4, 5, 1 . . . and if these are multiplied in turn by the last digit of the recurring decimal, which is 7, you get 21, 14, 42, 28, 35, 7 . . . The last digit of each of these gives the decimal for 17 = 0.142857 . . . The remainders and the last digit of the recurring decimal can be easily obtained
- 9. Sutra 13, The Ultimate and Twice the Penultimate can be used for testing if a number is divisible by 4. To find out if 9176 is divisible by 4 for example we add the ultimate which is 6 and twice the penultimate, the 7. Since: 6 + twice 7 = 20 and 20 is divisible by 4 we can say 9176 is divisible by 4. Similarly, testing the number 27038 we find 8 + twice 3 which is 14. As 14 is not divisible by 4 neither is 27038
- 10. Sutra 14, By One Less than the One Before is useful for multiplying by nines. For example to find 777 × 999 we reduce the 777 by 1 to get 776 and then use All from 9 and the last from 10 on 777. This gives 777 × 999 = 776/223.
- 11. Sutra 15, The Product of the Sum was illustrated in the Fun with Figures book for checking calculations using digit sums: we find the product of the digit sums in a multiplication sum to see if it is the same as the digit sum of the answer. Another example is Pythagoras’ Theorem: the square on the hypotenuse is the sum of the squares on the other sides.
- 12. Sutra 16, All the Multipliers is useful for finding a number of arrangements of objects. For example the number of ways of arranging the three letters A, B, C is 3×2×1 = 6 ways.