- iOS App Store
- Paid
- Yasuyoshi Ota
- Education, Lifestyle
Release Date: October 2010Last Update On: June 2023
Learn & Exercise How to multiply double digit numbers quickly. 19x17 (19+7)x10 + 9x7 = 323 (Method-A1) 58x58 ((5x5)+8)x100 + 8x8 = 3364 (Method-A6)