= 14 = 7 x 2 = 2/7 Factors or simply just 14 x 20 =280
= 20 = 10 x 2 = 2/10 Factors
= 2 x 2 =4 Cross multiply
= 7 x 10 = 70
Jackson's method by algebra and by adding to the product of 14 and 12
14(8+12)
112+ 160
= 280
Jackson was right in this discussion, as the process within-algebraic shows clarity of the two multiples; being 154 x 8 and 14 x 12, without this we cannot check for mistakes, and we cannot learn from correct answers as often.
