The school principal orders 6 new chalkboards for each grade. There are 3 grades in the school. Each new chalkboard cost $98. What is the total cost for the new chalkboards? Explain how you found your answer.

There are 3 grades that are going to get 6 new chalkboards each. So multiply 3 and 6 so you get 18. Each chalkboard costs $98 so multiply 18 chalkboards by $98 each. Then you get $1764 for all of the chalkboards.