![]() Multiply 3996 by 1001 and divide the final response by 7.Multiply the selected number by 9 and the product by 111.Choose any natural number between 1 and 6, say 4.The mind-bending, fun trick shows that a series of multiplication and division for any number between 1 and 6 gives an answer containing the digits 1, 2, 4, 5, 7, and 8. Place all the three answers in order and you get 424.Subtract the first digit from 9 (9 – 5 = 4), the second digit from 9 (9 – 7 = 2), and the third digit from 10 (10 – 6 = 4).Here, the first digit is 5, the second is 7, and the third digit is 6. Subtract three-digit numbers from 1000 with these simple steps. Subtracting a three-digit number from 1000 Prefix 72 to the first digit’s square (25), i.e., 7225, which is square of 85.ĩ.Now, add 1 to the first digit (8 + 1 = 9) and multiply the new number with the first digit (9 X 8 = 72). ![]() To square 85, first do the last digit’s square, i.e., square of 5 (5 X 5 = 25).Squaring a two-digit number ending with 5Ī math trick to help calculate the square of a two-digit number that ends with 5. Add 1 to the final answer, i.e., 2601, which is the square of 51.Ĩ.Add the difference (50) twice to its square, so you get 2500 + 50 + 50 = 2600. For instance, if you select 51, then 51-1 = 50. Select any two-digit number that ends with 1 and subtract 1 from it.Squaring a two-digit number ending with 1Ĭalculate the square of a two-digit number ending with one, with this trick. As 63 is greater than 48, 7/8 is greater than 6/9.ħ.Multiply the second fraction numerator with the denominator of the first fraction the answer is 48.Multiply the numerator of the first fraction with the denominator of the second fraction the answer is 63.Problem – 7/8 and 6/9, which fraction is greater? In such cases, this easy trick can be of great help to children. Ĭomparing fractions can be challenging, especially when the denominator for given fractions is not the same. Add 1 (from 16) to the first 8 and shift 6 out of the bracket.After step 1, as shown above, the resulting equation will be 8 (16) 8.Suppose the addition of the middle digit gives a two-digit number, then the trick has an additional step. Add 2 to 5 and place the sum in between the digits that you need to multiply by 11.This simple trick teaches a fast method to multiply a two or three-digit number by 11 with relative ease. Related: How To Use An Abacus To Teach Maths? 5.
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