• Seven teachers go to the park.
• Each teacher takes 7 students.
• Each student brings 7 fishbowls.
• Each fishbowl has 7 fish.

How many go to the park?

Record an estimate that is:

1. We used 2 different ways to multiply numbers earlier in the school year. 

   

   

   1. In Method A, where do the 12, 20, and 800 come from?
   2. In Method B, where does the 1 above 416 come from?
2. Diego uses both methods to find the value of . He has a different result for each method.

   

   

   1. Can you tell which method shows the correct product, without using calculations? How do you know the other product is not correct?

   2. For the incorrect result, explain what is correct and what is incorrect in Diego's steps. Then show the correct calculation, using Method B.

3. Use either method to find the value of each product. Show your reasoning.

Here are 2 ways to find the value of .

1. In Method A, where do the 4, 30, 80, and 600 come from?

2. In Method B, which 2 numbers are multiplied to get these products.

   1. 34
   2. 680

3. Use the 2 methods to show that each equation is true.