11.08 Problems with mass

Find $0.11$0.11 t $+$+ $0.45$0.45 t, giving your answer as a decimal.

At a sporting match, the coach has $10$10 oranges in a container to give out to the team members at half-time. The container of oranges weighs $800$800 g.

Find $8.59$8.59 t $-$− $2.53$2.53 t, leaving your answer in decimal form.