Open Middle®
Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make the greatest/smallest difference.
Hint
What number(s) could or could not be be in the first box?
What strategies can help you think about subtraction?
If you found one way, are there other ways that also work?
What strategies can help you think about subtraction?
If you found one way, are there other ways that also work?
Answer
1000 – 342 = 658 is the greatest difference
1000 – 658 = 342 is the smallest difference
1000 – 658 = 342 is the smallest difference
Source: Ellen Metzger
Help! Can someone please explain how to solve this problem. We are struggling to not use two nines. I know I have to be missing something but can’t figure it out!
THANKS!
I start figuring number with the thousands first, then hundreds and so on. I considered if I would need columns to regroup. Got I right away to exactly 10,000
3749 + 6251.
Bro it’s easy enough just do1000-342=!
We found 1,000-876 = 124
You have a one in the subtraction and a one in the answer. :/
Ms. Foley, you can’t have two ones in it
1000 – 876 = 234
1000-876=124
I’m not sure if you can or can’t reuse the same numbers in the difference, but if you can then you could do 5,000 minus 367 equals 633.
*5,000 minus 367 equals 4633