Best Mental Math Tricks You Need to Know
1. Multiplying a given number by 2
2. Multiplying numbers which are multiples of 10
3. Multiplying a given number by 11
4. Adding three or more digit numbers
5. Squaring number ending in 5
6. Divisibility rule for number 2
7. Divisibility rule for number 4
Most important math tips and tricks.
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