Multiplying 2-digit by 1-digit Numbers

 A few weeks ago we learned how to multiply 2 digits by 1 digit with regrouping. We didn't use the standard algorithm that you are probably accustomed to however, so I thought it might be helpful if I reviews the "new" way. It relies heavily on children's knowledge of place value. That's why I like it! :o)

For example, when multiplying 16 x 8:

First, multiply 10 x 8. Write the product under the multiplication problem.

16
x 8
80

Next multiply 6 x 8. Write that product under the first product.

16 
x 8
80
48

Add the two products together. 

16
x 8
80
48
128

Try it out with your third grade mathematician! :o)