Question

A box has $10$ erasers. If a carton can hold $10$ such boxes, how many erasers are there in $10$ cartons? Woody distributes $500$ erasers in a school. How many cartons of erasers are left?

• A. $1000$ erasers, $5$ cartons are left.
• B. $10$ erasers, $6$ cartons are left.
• C. $100$ erasers, $5$ cartons are left.
• D. None of the above

Answer 1

The correct option is A $1000$ erasers, $5$ cartons are left.

Say:
Number of erasers a box has $=10$
Number of boxes a carton has $=10$
Steps:
We know that $10$ tens $=1$ hundred
Number of erasers in $10$ boxes $=10+10+10+10+10+10+10+10+10+10=100$ erasers
Number of erasers in a carton $=100$
Number of erasers in $10$ cartons $=100+100+100+100+100+100+100+100+100+100=1000$ erasers
Number of erasers distributed by Woody in a school $=500$
We know that $1$ hundred $=10$ tens $=100$ ones
$500$ erasers $=50$ boxes $=5$ cartons
So, $5$ cartons of erasers were distributed by Woody in the school.
Number of cartons left $=10–5=5$ cartons
Hence, option B is the answer.