there are 18 books that weights 6lbs each, how many lbs are there total?
Since you have 18 books that weigh 6 pounds each add 6 + 6 + 6 + 6 + (for 18 6's).
Multiplication is quick addition, so you can also get the answer by 18 x 6.
There are 108 lbs total! :)
18x6=108