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30 tens - 3 tens 3 tenths

User Skrealin
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 the expression 30 tens - 3 tens 3 tenths. A number proceeded by "tens" means that the number is multiplied by 10 while "tenths" means that the number is divided by 10. 30*10 - 3*10*3/10 equal to 300 - 9 or 291. 
User Olaf Dietsche
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