1. Counting up to Subtract Addition and Subtraction are related! They are called inverse operations. Think back to your fact families. 4 + 5 = 9 9 - 5 = 4 5 + 4 = 9 9 - 4 = 5 I can start at the second number and count up! Try it!

2. Ok…Those were to easy. Let’s try these!  456 - 167 Start at the second number and count up! Start with the ones…get to a ten! 167 + 3 = 170 168169 170 How many did I need to add to get to the ten?

3. Ok…Those were to easy. Let’s try these!  456 - 167 Start at the second number and count up! Start with the ones…get to a ten! 167 + 3 = 170 168169 170 How many did I need to add to get to the ten? 180 Now let’s count by tens…get to a hundred! 190 200 How many did I need to add to get to the hundred? 170 + 30 = 200

4. Ok…Those were to easy. Let’s try these!  456 - 167 Start at the second number and count up! Start with the ones…get to a ten! 167 + 3 = 170 168169 170 How many did I need to add to get to the ten? 180 Now let’s count by tens…get to a hundred! 190 200 How many did I need to add to get to the hundred? 170 + 30 = 200 Now let’s count by hundreds… get to 400! 300400 How many did I need to add to get to 400? 200 + 200 = 400

5. Ok…Those were to easy. Let’s try these!  456 - 167 Start at the second number and count up! Start with the ones…get to a ten! 167 + 3 = 170 168169 170 How many did I need to add to get to the ten? 180 Now let’s count by tens…get to a hundred! 190 200 How many did I need to add to get to the hundred? 170 + 30 = 200 Now let’s count by hundreds… get to 400! 300400 How many did I need to add to get to 400? 200 + 200 = 400 Now I just need to get from 400 to 456. From 00 to 56 is…..56!

6. Ok…Those were to easy. Let’s try these!  456 - 167 Start at the second number and count up! Start with the ones…get to a ten! 167 + 3 = 170 168169 170 How many did I need to add to get to the ten? 180 Now let’s count by tens…get to a hundred! 190 200 How many did I need to add to get to the hundred? 170 + 30 = 200 Now let’s count by hundreds… get to 400! 300400 How many did I need to add to get to 400? 200 + 200 = 400 Now I just need to get from 400 to 456. From 00 to 56 is…..56! To find my answer, now I just add up everything I added! 200 30 3 + 56

7. Ok…Those were to easy. Let’s try these!  456 - 167 Start at the second number and count up! Start with the ones…get to a ten! 167 + 3 = 170 168169 170 How many did I need to add to get to the ten? 180 Now let’s count by tens…get to a hundred! 190 200 How many did I need to add to get to the hundred? 170 + 30 = 200 Now let’s count by hundreds… get to 400! 300400 How many did I need to add to get to 400? 200 + 200 = 400 Now I just need to get from 400 to 456. From 00 to 56 is…..56! To find my answer, now I just add up everything I added! 200 30 3 + 56 289

8. Most of what we wrote you can do in your head. Your work should look like this.  456 - 167 167 + 3 = 170 170 + 30 = 200 400 + 56 = 456 200 + 200 = 400 Make sure you line it up!!! 200 30 56 + 3 289

9. Most of what we wrote you can do in your head. Your work should look like this. Let’s copy this part into our journals.  456 - 167 289 167 + 3 = 170 170 + 30 = 200 400 + 56 = 456 200 + 200 = 400 200 30 56 + 3 289

10. Try this one.  845 - 384 384 + 6 = 390 Hint: start with the bottom number. Count by ones. Stop at the first ten. Add on by: ones tens hundreds final number

11. Try this one.  845 - 384 384 + 6 = 390 390 + 10 = 400 Hint: start at 390. Count by tens. Stop at the first hundred.

12. Try this one.  845 - 384 384 + 6 = 390 390 + 10 = 400 400 + 400 = 800 Hint: start at 400. Count by hundreds. Stop at 800. (Look at your top number to see why.)

13. Try this one.  845 - 384 384 + 6 = 390 390 + 10 = 400 800 + 45 = 845 400 + 400 = 800 Hint: start at 800. Stop at 45. (Look at your top number to see why.)

14. Try this one.  845 - 384 384 + 6 = 390 390 + 10 = 400 800 + 45 = 845 400 + 400 = 800 Hint: Line them up! Then, add! 400 45 10 + 6 1 1 64

15. Try this one.  845 - 384 461 384 + 6 = 390 390 + 10 = 400 800 + 45 = 845 400 + 400 = 800 400 45 10 + 6 461

16. More practice.  173 - 34  492 - 347  722 - 581  192 - 17  1,022 - 347  4,642 - 1,874

17. More practice.  173 - 34 139  492 - 347  722 - 581  192 - 17  1,022 - 347  4,642 - 1,874

18. More practice.  173 - 34 139  492 - 347 145  722 - 581  192 - 17  1,022 - 347  4,642 - 1,874 Do the rest with paper and pencil by yourself. I might ask you to come work with me on the floor.

19. Put up your pencil and get out your red pen!

20. More practice.  173 - 34 139  492 - 347 145  722 - 581 141  192 - 17 175  1,022 - 347 675  4,642 - 1,874 2,768