From this question, we can deduce the following:
Number of packages she has = 3
Number of pencils in each package = 6
She needs an eraser for each pencil. Let's find how many erasers she will need to buy.
Let's first find the total number of pencils.
Here, we are to use the multiplication operation
We have:
Total number of pencils = Number of packages x Number of pencils in each package.
Total number of pencils:
3 packages × 6 pencils = 18 pencils..................................equation 1
Mariam has a total of 18 pencils.
Since she needs an eraser for each pencile, she will need 18 erasers for the 18 pencils.
18 pencils × 1 eraser = 18 erasers............................................equation 2.
ANSWER:
18 erasers