Answer:
<h2><u><em>
45 is the answer</em></u></h2>
Step-by-step explanation:
<h2>The number of baseball cards Bill has is a multiple of 5 and 9. To find the least number of baseball cards, find the LCM of 5 and 9.
</h2><h2>
</h2><h2>multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45,...
</h2><h2>multiples of 9: 9, 18, 27, 36, 45,...
</h2><h2>
</h2><h2>So, the least number of baseball cards Bill has is 45.
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