Adding
–15.8 + –3.45
–19.25
5/8 + –1/4
3/8
–2/5 * 5/7
–10/35
–3/4 + –1/8
–7/8
–12.3 – (–2.5)
–9.8
2.5 * (–1.2)
–3
2.3 + –5.75
–3.45
–2/9 – 5/18
–9/18 or –1/2
–9/10 * –2/5
18/50 or 9/25
–2/5 + 7/15
1/15
4.5 – (–10.12)
14.62
4.5 * –8.35
–37.575
–2.4 + 2 1/5
–1/5 or –0.2
–13.25 – 4 1/5
–17.45 or –17 9/20
–2 1/4 * –5 2/5
12 3/20 or 12.15