Old school joke but actually a new era of math called common core so now the jokes on our kids Smdh
0 | 7 1 | 3 7*1=7 7*3=21 If u don’t carry the 0 in 7*1(0) u get 7 rather then 70 so u get 7 21= 28 rather then 70 21=91 So if u fail to carry the 0 u will always get 28 regardless of how u put it together