Deci is our prefix
The meaning of deci is
 A combining form meaning ‘tenth’ used in words
denoting units of the metric system.
What is dm? it means
 A unit of length equal to 0.1 meter.
What is dg? It means
 A metric unit of mass egual to 1 tenth of a gram.
What does the deciliters mean?
 A unit of valum equal to 0.1 liter.
What does decisecond mean?
 It means one tenth of a second.
The End
By Jesse and Annie