Ms. Wasserman's 3rd Grade Math
                 Multiplication
Picture

Rule 10

Any time you multiply by 10 you simply add on a 0 to the next spot over. 

10 x 10 = 10 + 0 = 100
10 x 8 = 8 + 0 = 80
22 x 10 = 22 + 0 = 220

Also the multiples of 10 will ALWAYS end in 0.  No matter what. 

WORD PROBLEM: There are 6 groups of 10 kids on the field trip.  How many kids went on the field trip all together?

If you need more practice go to http://www.studyisland.com/