-20
2010 subtracted from1981 = 29
1980 subtracted by 2010 = -30
16
1990. However MXM is invalid because X should only be subtracted from C and L, not M. 1990 is normally written as MCMXC.
The subtrahend is subtracted from the minuend
2010 subtracted from1981 = 29
1980 subtracted by 2010 = -30
2010 subtracted by 1926 = 84
173
16
According to basic math, 2010-1984= 26.
-81
4000
20
4000
4000
1990. However MXM is invalid because X should only be subtracted from C and L, not M. 1990 is normally written as MCMXC.