Karen hangs 6 ferns around her house. Each fern has 7 fronds, and each frond has 30 leaves. How many leaves do all the ferns have?
First find the total number of fronds on all the ferns: 7 fronds/fern * 6 ferns = 
<gadget id="calculator">7*6</gadget>
<output>42</output>
42 fronds.
Then find the total number of leaves on 42 fronds: 42 fronds * 30 leaves/frond = 
<gadget id="calculator">42*30</gadget>
<output>1_260</output>
1260 leaves.

<result>1_260</result>