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)
2 Digit Multiplication is a free educational mobile app By Yasuyoshi Ota.It helps students practice the following standards .
Developer URL: https://app.brain-workout.org/category/eng/iphone_e/
Software Version: 2.1
Release Date: 2010-10-03T23:09:50Z