Start from right and move to the left when adding:
5+0=5
4+3=7
7+0=7
so:
745+30=775
It is: 668+77 = 745
30% off of 745= 30% discount applied to 745= 745 - (30% * 745)= 745 - (0.30 * 745)= 745 - 223.5= 521.5
-30 plus 60 = 30
30 + 80 = 110
3657 + 745 - 8756 = -4354
745
30 + 50 + 70 = 150
2+40+30=72
30
30
40+-30=10
150 plus 3 times 30 is equal to 240.