Addition

Addition

  1. Rapid Mental Calculation Tips - Addition
  2. The complement number method
  3. Special case: 27 + 72, 35 + 53 ......
  4. How to add a number which is close to 100, 1000, 10000 .....
  5. The easier method to calculate 28 + 53 =  
  6. Addind a series of numbers
Fraction
  1. Two numbers with different denominator

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