Learn & Exercise How to multiply double digit numbers quickly.Practicing these methods is, by itself, a good brain training.19x17(19+7)x10 + 9x7 = 323 (Method-A1)58x58((5x5)+8)x100 + 8x8 = 3364 (Method-A6)Please see the following site for how to use this app.https://android.brain-workout.org/mathmethod/
2Digit Multiplication
