It is: 4/5 minus 3/10 = 1/2
7/10 - 2/5(4/10) = 3/10
4.7 - 10.3 = -5.6 or negative (five and six tenths).
2/5 - 7/10 = 4/10 - 7/10 = (4-7)/10 = -3/10 negative three tenths
4 and 4 tenths...
3/4 minus 7/10 is 1/20.
4 and two fifths
7 3/10 - 4 4/10 = 2 9/10, or two and nine tenths.
4 tenths
2/5 - 3/10 = 4/10 - 3/10 = 1/10
3 x 2 = 6 6 - .4 = 5.6
Since LCM(4, 5, 10) = 20, 1/4 - 2/5 - 3/10 = 5/20 - 8/20 - 6/20 = -9/20