Subtraction
55-24
31
281+24
305
1:17 to 2:17
60 min or 1hr
half past 5
5:30
m= 6+10
75-23
52
130+74
204
6:30 to 7:45
1hr 15min
half past 11
11:30
6+m=10
m=4
335-125
210
165+420
585
4:15 to 6:45
2hrs 30min
Quarter to 11
10:45
33+m=66
m=33
812-564
248
614+157
771
5:20 to 7:50
2hrs 30min
Quarter past 12
12:15
147+m=306
m=159
924-437
487
157+265
422
3:16 to 5:26
2hr 10min
Quarter to 2
1:45
m+555=555
m=0