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