This is a trick everybody should know- 456 tens = 4560 . most of the people don't understand this part . Now pay attention to this 456 - _______ = 2456 ( 4560 - _______ = 2456 )Now __________ = 4560 - 2456 . If we do the following subtraction sum, we shall find out the answer i . e. 2104 meaning 4560 - 2456 = 2104