Hint #1
If you did it like this:
1 + 2 + 3 + 4 + 5 + 6 + 7
That wouldn’t work because that sums up to 28.
Hint #2
And if you did it like this:
12 + 34 + 56 + 7
That also would not work because that sums up to 109.
Hint #3
There’s actually two correct answers. Each starts with “1+”. Can you figure them out?
Answer
1 + 23 + 4 + 5 + 67 = 100
OR
1 + 2 + 34 + 56 + 7 = 100