A three-digit number and tens

1.		Adding tens: 120 + ? = 140; 120 + 50 = ?
2.		Adding tens: 145 + ? = 155, 145 + 30 = ?
3.		Adding tens: 138 + ? = 178, 178 + 20 = ?
4.		Adding Tens 167 + * = 197
5.		Adding Tens: 416 + 50 = *
6.		Adding Tens: 542 + 50 = *
7.		Adding Tens: * + 726 = 786
8.		Adding Tens: * + 314 = 394
9.		Adding Tens: 142+?=182
10.		Adding Tens: 30+?=574
11.		Adding Tens: 235+50 =?
12.		Adding Tens: 338+50=?
13.		Adding Tens: 562+30=?
14.		Adding Tens: ?+30=492
15.		Take Tens: 67-?=47,430-70=?
16.		Take Tens: 71-?=21,250-30=?
17.		Take Tens: 66-?=36,360-80=?
18.		Take Tens: 94-?=54,740-20=?
19.		Take Tens: 89-?=19,460-50=?
20.		Take Tens: 86-?=26,170-40=?
21.		Take Tens: 45-?=35,580-90=?
22.		Take Tens: 62-?=22,880-50=?