648+203
=648+200+3
=848+3
=851
98x32
=100x32-2x32
=3200-64
=3136
36x15
=9x4x15
=9x60
=540
254+72+46
=(254+46)+72
=300+72
=372
138-37-63
=138-(37+63)
=138-100
=38
129-(29+57)
=129-29-57
=100-57
=43
43+43x99
=43x(1+99)
=43x100
=4300
48x101-48
=48x(101-1)
=48x100
=4800
57x69+69x43
=(57+43)x69
=100x69
=6900
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