1. 5 + 22 + 37 + 2
= 27 + 39
= 66
2. 12 - 6 + 26 - 4
= 6 + 22
= 28
3. (2016 + 450) - 2016
= 2016 + 450 - 2016
= 2016 - 2016 + 450
= 450
4. 364 - (364 - 111)
= 364 - 364 + 111
= 0 + 111
= 111
5. 1972 - (638 + 972)
= 1972 - 638 - 972
= 1972 - 972 - 638
= 1000 - 638
= 362