Three addends
5 + 6 + 7 =
18
7 + ____ = 17
17 - _____ = 7
10
13 + 10 =
23
100 + 100 =
200
18 - 8 =
10
11 + 12 + 13 =
36
9 + ____ = 18
18 - 9 = _____
9
15 + 10 =
25
120 + 100 =
220
22 - 10 =
12
22 + 33 + 44 =
99
15 + ____ = 23
23 - _____ = 15
8
33 + 33 =
66
135 + 110 =
245
26 - 15 =
11
44 + 45 + 46 =
135
12 + ____ = 24
24 - _____ = 12
12
55 + 55 =
110
116 + 115 =
47 - 25 =
22
64 + 65 + 66 =
195
17 + _____ = 38
38 - ______ = 17
21
77 + 76 =
153
355 + 245 =
600
99 - 29 =
70