Counting in 50s is just like counting in 5s but with an extra zero. This is because the numbers are ten times bigger. There are 350 chocolates in 7 boxes. Another way you could have worked this ...

Counting in 50s is just like counting in 5s but with an extra zero. This is because the numbers are ten times bigger. There are 350 chocolates in 7 boxes. Another way you could have worked this ...