Multiplying by 12

Multiplying by 12

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 10 by 12.

Multiple Choice

12 x 7=

• 77

• 84

• 74

• 94

12 rows of 7

12 x 7 = 84

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

We can split x12 into x (10+2)

12 rows of 9

12 x 9 = 108

What is the distributive property?

To “distribute” means to divide something or give a share or part of something. According to the distributive property, multiplying the sum of two or more addends by a number will give the same result as multiplying each addend individually by the number and then adding the products together. 

Open Ended

How does the distributive property help you to solve x12 facts?

For the next few slides, JUST PUT THE NUMBER!

It will be marked wrong if you put anything other than the answer.

In summary,

• To multiply by 12, think of 10 groups and 2 more groups.

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

• The commutative property can help. (You can multiply numbers in any order and the answer will always be the same.)

• For the equation 7 × 12, you can see the 12 as one of the factors and know that you can use this “add two groups” strategy to solve this equation.