Mastering mental math makes you faster, smarter, and ready for any challenge! Topic 01 : Addition and SubstractionTopic 02: Table upto 99Topic 03: Decimal NumbersTopic 04: Multiplication 2 by 2 DigitsTopic 05: Find the Half of a NumberTopic 06: Find the Double of a NumberTopic 07: Find the Double of a NumberTopic 08: Find the Four Times of a NumberTopic 09: One Fourth of a Number Topic 10: Multiplication by 5Topic 11: Multiplication by 25Topic 12: Multiplication by 50Topic 13: Division by 5Topic 14: Division by 25Topic 15: Division by 50Topic 16: Square of a NumberTopic 17: SquareRoot of a NumberTopic 18: Cube of a NumberTopic 19: CubeRoot of a Number .