Four families went out for lunch. The total food bill came to $220. The families also left a $30 tip for the waitress. If each family spent the same amount, about how much did each family spend on dinner? Complete the explanation on how you found your answer.

First, add $
and $30 to find the total bill.

$
is between $
and $
, but closer to $
. $
× 4 = $240, so each family spent about $
on lunch.