75 + ____ = 100
____ - 200 = 600
4 x _____ = 20
81 : ____ = 9
65 + _____ = 100
275 - _____ = 225
_____ x 7 = 49
______ : 8 = 6
25 x ____ = 100
500 + ____ + 250 = 1.000