6)
-1/8 - 6 7/8
= - ( 1/8 + 6 7 /8)
= -(6 7/8 + 1/8)
= -(6 + (7 + 1)/8)
= -(6 + 8/8) = -7
= -7
8)
-4 * (7/10)
= -4*7/10
= -28/10 2 into 28 is 14 and 2 into 10 is 5.
= -14/5 or -2.8
10)
-19/2 ÷ (38/7)
-19/2 * 7/38 19 into 19 is 1 and 19 into 38 is 2
-1/2 * 7/2
= -(7*1)/(2*2)
= -7/4
Hope this explains it.