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SmarticalParticals
Well... to find 61 tens, just write 61 with the 1 in the tens place then all remaining places to the decimal get a zero (in this case that's just the ones place). So...

61 tens = 610

100 less than 610 is

610 - 100 = 510
ava4swim
Well yiu need to find out what is 61 tens so 61 x 10 = 610. 610-100=510
Your answer is 510