6-1 Trade-First Subtraction

6-1 Trade-First Subtraction

Math Message

Using base-ten shorthand (boxes, sticks, and cubes), show the number 231 in a least two different ways.

Multiple Choice

Is the picture a way to show 231 in base-ten shorthand?

• yes

• no

Multiple Choice

Is the picture of base-ten shorthand a way to show 231?

• yes

• no

Multiple Choice

Is the picture of base-ten shorthand a way to show 231?

• yes

• no

Multiple Choice

Is the picture of base-ten shorthand a way to show 231?

• yes

• no

Have your Math Journal on page 189 #1 to work along with me.

Now you try:

 $406-389=?$  

This is math journal page 189 #2

Multiple Choice

Is 400 greater than 300?

• yes

• no

Multiple Choice

Is 0 greater than 80?

• yes

• no

Multiple Choice

Is 0 equal to 80?

• yes

• no

Multiple Choice

Is 6 greater than 9?

• yes

• no

Multiple Choice

Is 6 equal to 9?

• yes

• no

Multiple Choice

Do we need to make some trades for problem #2 on page 189?

• yes

• no

Now practice trade-first on page 190 in your Math Journal.

The end!