self Maths Puzzle

prove this equation;100-101=1 u can move single digit only and donot move morethan one digit and donot use any operators?

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self Other Question
how many times the hour and minute hands cross each other in a day A train leaves Delhi at 6.00 a.m. and reaches Agra at 10.00 a.m. Another train leaves Agra at 8.00 a.m. and reaches Delhi at 11.30 a.m. At what time do the two trains cross each other if the distance between Delhi and Agra is 200 km?
a) '8.45 a.m.' b) '8.56 a.m.' c) '9.20 a.m.' d) 9.56 a.m.'