Walt: use multiplication facts we know to solve larger multiplication problems by rounding and compensating.
My maths group and I has been focusing on our timetables. We were working on multiplication facts to solve larger multiplication problems. Such as the question 17 x 26 which equal what? So I started with the 10's, 10 x 20 = 20, then timing 10 with 6 which equals 60. Next I did the 1's. 7 x 20 = 140 and 7 x 6 = 42. I added all of the answers which equals 442.