12 Times Tables: Extending the Sequence Trick

12 Times Tables: Extending the Sequence Trick

I am learning to use what I know about properties of multiplication and place value to multiply numbers by 12.

Success Criteria

I can use the distributive property to multiply numbers within 15 by 12.

Yesterday, we used the distributive property to multiply by 12 in our regular times table.

We cut 12 up into two pieces, 10 and 2. We multiplied our factor by 10 and then added it to our factor multiplied by 2.

Multiple Choice

12 x 11

• 121

• 132

• 143

• 1,200

How can we use the distributive property to help solve x12 facts?

We can also use our 11 times table trick. (We add the two digits in 12 together and that is the filling of our sandwich. The bread is the 1 and the 2. 12 x 11= 132)

Fill in the Blanks

Tom gets $12 for allowance every month.

If he saves all the money, how much will he have after a year?

He will have

dollars.

Open Ended

Write a word problem to represent this equation and solve it.

12 x 14

Open Ended

Explain the strategy that you would use to solve this equation.

12 x 13 = ___

Fill in the Blanks

12 x 15 =

An understanding of place value and the standard algorithm can also explain the 10 groups and 2 more group method.

• For a fact like 12 × 7, think 10 × 7 = 70, then add two groups of 7 (14) to make 84.

• For a fact like 12 x 15, think 10 x 15 = 150, then add two groups of 15 (150 + 30) to make 180.