Multiplication

Multiplication

We practiced 2 by 1, 3 by 1, and 4 by 1 multiplication for several days before jumping right in to 2 by 2 multiplication.

To start 2 by 2 multiplication, we practiced the Box Method.

Solve 46 x 25.

Students break apart the numbers into tens and ones and place each group beside the boxes.

Next, multiply the numbers on the outside of each box.

Add the products to find the answer.

Once students understood that each number in the problem needed to be multiplied by each of the other numbers, it helped the standard algorithm make more sense.  

We also practiced creating equations from word problems and solving multiplicative comparison problems.

Example:

Sarah is 3 times as old as Jackson.

Jackson is twice as old as Cooper.

Cooper is 2 years old.

How old is Jackson?

How old is Cooper?