Answer:
-1.175
Explanation:
-4/5 + (-3/8) = -4/5 + (-3/8) = -4 · 8/5 · 8 + (-3) · 5/8 · 5 = -32/40 + (-15/40) = -32 + (-15)/40 = -47/40
The common denominator you can calculate as the least common multiple of the both denominators - LCM(5, 8) = 40. The fraction result cannot be further simplified by cancelling.
In words - minus four fifth plus minus three eighth = minus forty-seven fortieth.