Train your mental math with 1x1 What's 7 x 8? 56. Could you instantly solve that question in your head? Train your mental math for addition, subtraction, multiplication and division. Train your mental math with number ranges of 1-10 (ten), 11-100 (one hundred) and 101-1000 (one thousand). Get asked a simple math question once per hour in the OneAndOne Quick Question Widget. Study and train for any grade (1st, 2nd, 3rd, 4th, 5th, 6th, etc), your gre prep or a levels and become a multiplication table genius!