Adding by 10s
32 + 10 =
42
101 + 100 =
201
70 - 10 =
60
900 - 100 =
800
75 + 12 =
87
43 + 10 =
53
341 + 100 =
441
92 - 10 =
82
775 - 100 =
675
65 - 23 =
42
27 + 20 =
47
727 + 100 =
827
54 - 10 =
44
341- 100 =
241
72 + 26 =
98
18 + 30 =
48
345 + 200 =
545
67 - 20 =
47
927 - 200 =
727
95 - 31 =
64
32 + 50 =
82
487 + 400 =
887
88 - 40 =
48
657 - 400 =
257
49 + 41 =
100