Ella has 50 stacks of ten pennies in each stack described how to find how many pennies ella has in all

You have to do 10 x 50 bc she 50 stacks of 10 pennies

First, find the amount of pennies in each stack, which is ten as the problem says. Next, multiply the number of stacks by the number of pennies in each stack (50 x 10). That will be your answer. Hope this helps!