Subject: Grade 4 Math Help !!!
Who are you: Parent
We're having a hard time with this question.......
Write the digits 1 to 9 on index cards, arrange the cards to form three 3-digit numbers (using each card only ONCE).
The third number is the sum of the first two numbers
** how many different ways can you do this?? **
Apparently there are 320 different solutions but we can't even come up with ONE !! HELP !!