Lesson 2.3 Multiplication 2 by 2 digit Standard Algorithm

Standard Algorithm - 2 by 2 digit

Challenge: I can FLUENTLY multiply 2 by 2 digit Numbers by following each step of standard algorithm.

​Let's Review and Warm Up Our 🧠

​You will find the area of this rectangle.

Fill in the Blanks

What is the area? $21\ \times\ 36\ =\$  

Did yours turn out like this?

Fill in the Blanks

39 x 41 = ?

Match

Match the following multiplication problems with their answers . You can work with a partner on this problem.

• 29 x 31

• 26 x 35

• 70 x 61

• 53 x 27

• 39 x 62

899

910

4270

1431

2418

• 899

• 910

• 4270

• 1431

• 2418

Open Ended

Ryder thinks following the standard algorithm with these two examples will give different products. Is he correct? Explain your thinking

Multiple Select

Three students used the standard algorithm to multiply the same two two-digit numbers. Two students made a mistake. Find the two mistakes.

Open Ended

Where did Nadia go wrong?

Open Ended

Where did Archie go wrong?

Poll

On a scale of 1-4, how are you feeling about multiplying 2 by 2 digit numbers?

• 1

  I have no idea what is going on

• 2

  I kind of get it but I still need a little help.

• 3

  I got it and can do it myself.

• 4

  I got it and can teach others.

Poll

How did you do on today's challenge of: I can FLUENTLY multiply 2 by 2 digit Numbers by following each step of standard algorithm. ?

• I can do better.

• I did ok.

• I conquered it!

• Not only did I beat the challenge, I owned it!