Jackson collects 45 hermit crabs, 3 spiral shells per hermit crab, and 2 starfish per spiral shell. How many souvenirs does he collect total?
First find the number of spiral shells Jackson collects: 45 hermit crabs * 3 spiral shells/hermit crab = 
<gadget id="calculator">45*3</gadget>
<output>135</output>
135 spiral shells.
Then find the number of starfish he collects: 135 spiral shells * 2 starfish/spiral shell = 
<gadget id="calculator">135*2</gadget>
<output>270</output>
270 starfish.
Then add the number of each animal he collects to find the total number: 135 spiral shells + 270 starfish + 45 hermit crabs = 
<gadget id="calculator">135+270+45</gadget>
<output>450</output>
450 souvenirs.

<result>450</result>