Equations, inverse operations and the clock
Answers are for parents and teachers.
1
Solve: 480 − (n − 345) = 255. n = ?
570
2
Solve: (y − 211) + 117 = 658. y = ?
752
3
Yuri Gagarin spent 1 h 48 min in space. How many minutes is that?
108
4
Aziz goes to bed at 21:00 and wakes up at 7:00. How many hours does he sleep?
10
5
If t = 40, then 500 − t + 60 = ?
520