Question

Can you find the sum [5.5+ (-2.3)] + (-5.5+2.3) without performing any additions?

Answer 1

Yes
[5.5+(-2.3)] can be rearranged to be 5.5-2.3. It will be 3.2
(-5.5+2.3) can be rearranged to be 2.3-5.5. It will be -3.2
3.2-3.2=0