Mathematics magical tricks
Mathematics magical tricks Here are a few math tricks that you might find helpful: Multiplying by 9: To multiply a number by 9, simply multiply the number by 10 and then subtract the original number. For example, to find the product of 9 and 6, you can multiply 6 by 10 (60) and then subtract 6 from that (54). Squaring a number ending in 5: To square a number ending in 5, take the tens digit and multiply it by the next highest number, and then append 25 to the end. For example, to find the square of 35, you can take the tens digit (3) and multiply it by the next highest number (4) to get 12, and then append 25 to get 1225. Multiplying by 11: To multiply a number by 11, add the digits of the number together and put the sum in the middle, with the first and last digits remaining the same. For example, to find the product of 11 and 23, you can add 2 + 3 to get 5, and then put 5 in the middle of the original number to get 253. Divisibility by 3: A number is divisible by 3 if the sum