150
100 + 50 - 200 - 220 = -270
50 - -50 = 100
100$
57/100 - 23/100 = 34/100 or 17/50
350 percent
51 over 100
In Roman numerals L and C are 50 and 100 respectively. So substitute 50 and 100 into the equation and let the unknown be called z. 50-z = 100 -z = 100-50 -z = 50 --z = -50 Solution: z = -50 Substituting -50 into the equation: 50--50 = 100 or L--L = C. Remember that in maths a double minus sign before a number changes that number into a plus number. Check it out on your calculator. David Gambell, Merseyside, England.
910 minus 50 is 860.
45 minus -50 is 95.
0.2 minus 50 is -49.8
10
100 minus 393 = -293