There's nothing to drag, but I think you might be looking for this:
30+10+8+7=40+15=55
37+18=
Drag the number to show the partial sums and the sum
Numbers may be used once or more than once or not at all
1 answer
Drag the number to show the partial sums and the sum
Numbers may be used once or more than once or not at all
1 answer