WK 6 D3

Which number do I draw with base ten blocks 45 - 17 ?

• Draw 45 in the boxes

• Draw 17 in the boxes

45

-17

• Is there more on the top or more on the floor?

• More on top!

• More on the floor!

How will I be able to take 5 away from 7?

• You need to regroup and take away a ten!

• Easy. 5-7=2.

How did the ones become 15?

• We regrouped and got a ten from the tens place.

• Just because

Why did the 4 change to a 3 in the tens place?

• Just because

• We regrouped so the ones would have enough to subtract.

45

-17

28

How would I check this problem?

• 28

  +17

  45

• 17

  +17

  34