Mystery Math Mistake Three Digit Addition

hi math friends thanks so much for joining me and my name is Shannon from is the number for teachers dot org today we're going to be doing mystery math mistake with addition I'm going to be adding 346 + 137 your job is to find out where my mystery math mistake is first I'm going to start off adding the traditional way in this problem by adding my ones and then my tens and then my hundreds I'm going to start off first doing my six plus seven know that 6 plus 7 equals 13 so I'm going to put my 3 down here and then I'm going to just decide to pre group at the top do tap regroup so can see my 110 and my three ones knowing that 6 plus 7 is 13 next I'm going to add my 40 plus my 30 which know is going to give me 70 or if you can think of it as four tens plus 3 tens equals seven tens and then I'm going to go into my hundreds and add my three hundred plus 100 which is going to equal four hundred so know that 346 + 137 equals 473 do you agree with the way that solved the problem it's time for you to pause the video and to show us on our mystery math mistake recording form how you saw me solve the problem on the video and then how you think the problem should be solved flip it over onto the back and you can explain the mystery math mistake as to where the mistake maybe happened in this video can't wait to hear your feedback to see if you can find my mystery math mistake in 346 plus 137 which think equals 473 thanks so much for joining us