Its not 19 because first 3 x 3 is 9 now we throw away the 9 sense we know that then 10 + 10 is 20 then we have to add one more 10 bc of the 3 so we put the 10 in the ones place and then add witch would be 210 but we don’t need the 0 so we throw that away to make 21 this guy is so smart.
Пікірлер: 68