Friday, 6 October 2017

Finger magic

  • For 9 tables, keep the ten fingers of your hands open. 
  • For 1x9, close the thumb finger of one hand, you could see 9 fingers. So, the answer is 9.
  • For 2x9, close the index finger of one hand. You could see 1 before the closed finger and 8 after that. So the answer is 18.
  • For 3x9, close the middle finger of one hand. You could see 2 before the closed finger and 7 other fingers after it. So, the answer is 27.
This method will work till 9x9!
Mersal Mathematics: 5 Shortcuts for Multiplication

Reverse of numbers

Write down vertically the numbers from 0 to 9 in ascending order. Besides that, write down the numbers 9 to 0 in descending order. Once you finish it, surprise! You will get the answer for 9 tables!
09
18
27
36
45
54
63
72
81
90

Simple Subtraction

For 99 tables, you could use 100 tables. Here's how:
  • Say 56 x 99 is the question.
  • Multiply 56x100. The answer is 5600.
  • Subtract 5600-56. The answer is 5544, which is 56x99!

Addition of zero

For any two digit numbers, follow this technique:
Example:
32x42=1344
  • Step 1: 32x4 = 128
  • Step 2: Add 0 to the right of the number. It becomes 1280
  • Step 3: 32x2=64
  • Step 4: Add 1280+64
  • Step 5: The answer 1344 is got!

Big digits, small effort

For multiplication of any big digit numbers with 9, here's an easy method:
Take an example, 987654x9. The answer for this is 8888886.
  • Step 1: Add 0 to the right of the big digit. It becomes 9876540.
  • Step 2: Subtract it with the big digit in the question. 9876540-987654.
  • Step 3: It results in the answer 8888886!

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