So that's the test for 43. Meanwhile, 3x47=141. So the test for 43 is the test for 141. Mult. the 1s place by 14 and subtract from the priors. Look at 53. 3x53 is 159. The test for 53 is to multiply the 1s place by 16 and add to the priors. I'll write out the other tests later.