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Grade: 

                        
multiply by 9 the last digit goes 9,8,7,6, ... your hands can help! Example: to multiply 9 by 8, hold your 8th finger down, and count "7" and "2", the answer is 72
6 years ago

Answers : (1)

Sourabh Singh
IIT Patna
askIITians Faculty
2104 Points 
							
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4 years ago
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