49.1 multiplied by 1/10 is 4.91
491 is CDXCI. CD is 500 - 100. XC is 100 - 10. (I is 1.)
1-492 = -491
20/10 × 20/1 = 40/1
1/2 x -10 = -5
1 minus 2 plus 123 times 4 is equal to 491.
10
(5/1)*(1/10)= 0.5
XDI - D=500, X=10 and I=1... Placing the X before the D means you subtract it from the larger number, then add the 1. Another (longer) way to write it would be CCCLXXXIX (100+100+100+50+10+10+10+9)Additional Information:-In today's notation of Roman numerals 491 is: CDXCIBut the Romans themselves would have worked out 491 as CCCCLXXXXI and then simplified it to XDI (501-10 = 491) which uses less numerals but of equal value
1/10 x 4/10 is 1/25
10
It is 2.
(1/10) / 6 = use reciprocals and multiply....10 over 1 times 1 over 6= 10 over 6 then simplify = 5 over 3.