360 zebra mussels ride into Lake Michigan on the bottom of a ship. They find lots of food and no predators, so their population grows. A year later, there are 2 more zebra mussels in the lake. How many zebra mussels are there now?
362
Abby has a chest of coins. Inside, there are 578 gold coins and 23 silver coins. How many coins are in the chest?
601
When Ken went to bed, there were 634 birds on the lake. That night, a flock of 20 birds joined them. How many birds were on the lake when Ken woke up?
654
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