Session 1:

Title of the puzzle

Solve these without a calculator. What is 10 x 20?

• 10 x 20
• 22 x 30
• 68 x 70

Can you do each of these within 10 seconds?

Have you thought about doing this in multiple bites?

Step 1

Try multiplying in two steps.

Step 2

20 = 10 x 2.

10 x 20

10 x 10 x 2

100 x 2

200

Check that your answer has blah.

Title of the puzzle

Solve these without a calculator. What is 10 x 20?

• 10 x 20
• 22 x 30
• 68 x 70

Can you do each of these within 10 seconds?

Have you thought about doing this in multiple bites?

Step 1

Try multiplying in two steps.

Step 2

20 = 10 x 2.

10 x 20

10 x 10 x 2

100 x 2

200

Check that your answer has blah.

Title of the puzzle

Solve these without a calculator. What is 10 x 20?

• 10 x 20
• 22 x 30
• 68 x 70

Can you do each of these within 10 seconds?

Have you thought about doing this in multiple bites?

Step 1

Try multiplying in two steps.

Step 2

20 = 10 x 2.

10 x 20

10 x 10 x 2

100 x 2

200

Check that your answer has blah.

Homework

Complete by (Wed) 21:00. This should take no more than n* minutes.