Draw to show how you can use models to compare 345 and 391

Is it greater than or less than7*3_9*2

2.5 milligrams is equivalent to how many grams

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655