1. Created by V. S. Bell H. H. Beam Elementary School Gastonia, NC 28052

2. Let’s subtract! Subtract means to take away!

3. Use the EOG grid paper for student work. Ask students to practice along with the PowerPoint. Give students the quiz problem at the end for assessment. Then, show the correct work.

4. Let’s subtract! Subtract means to take away! How many more? How many left? Difference? Have left?

5. Let’s subtract! Subtract means to take away! X = 10 Tens Row = 1 Ones Row = 100 Hundreds Row Remember: Largest number goes first!

6. Problem #1 500 - 137 = n 500 -137

7. Step #1. Show how many you have in the beginning. 500 - 137 = n 500 XXXXX HTOHTO

8. Step #2. Subtract the number of hundreds. 500 - 137 = n 1 XXXXX HTOHTO

9. Step #2. Subtract the number of hundreds. 500 - 137 = n 1 XXXXX HTOHTO

10. Step #3a: Subtract the number of tens. 500 - 137 = n 3 XXXXX HTOHTO

11. Step #3b: Are there any tens showing? 500 - 137 = n XXXXX NO! Please regroup! HTOHTO

12. Step #3c: Circle one hundred and draw marks for 10 tens? 500 - 137 = n XXXXXX HTOHTO

13. Step #3d: Mark out the number of tens? 500 - 137 = n 3 XXXXXX HTOHTO

14. Step #4a: Subtract the number of ones? 500 - 137 = n 7 XXXXXX HTOHTO

15. Step #4b: Are there any ones showing? 500 - 137 = n XXXXXX HTOHTO NO! Please regroup!

16. Step #4c: Circle 1 ten and make marks for 10 ones. 500 - 137 = n XXXXXX HTOHTO

17. Step #4d: Mark out the number of ones. 500 - 137 = n 7 XXXXXX HTOHTO

18. Step #5: How many hundreds do you have left?. 500 - 137 = XXXXXX 3 3 HTOHTO

19. Step #6: How many tens do you have left?. 500 - 137 = XXXXXX 6 36 HTOHTO

20. Step #7: How many ones do you have left?. 500 - 137 = XXXXXX 3 363 HTOHTO

21. Congratulations! You have subtracted across zeroes with regrouping! 500 - 137 XXXXXX 363 HTOHTO

22. Problem #2 700 - 246 = n 700 -246

23. Step #1. Show how many you have in the beginning. 700 XXXXX HTOHTO 700 - 246 = n XX

24. Step #2. Subtract the number of hundreds. XXXXX HTOHTO 2 700 - 246 = n XX

25. Step #3a: Subtract the number of tens. 4 XXXXX HTOHTO 700 - 246 = n XX

26. Step #3b: Are there any tens showing? XXXXX NO! Please regroup! HTOHTO 700 - 246 = n XX

27. Step #3c: Circle one hundred and draw marks for 10 tens? XXXXX HTOHTO XX 700 - 246 = n X

28. Step #3d: Mark out the number of tens? 4 XXXXX HTOHTO 700 - 246 = n XXX

29. Step #4a: Subtract the number of ones? 6 XXXXX HTOHTO 700 - 246 = n X

30. Step #4b: Are there any ones showing? XXX NO! Please regroup! HTOHTO XXX 700 - 246 = n

31. Step #4c: Circle 1 ten and make marks for 10 ones. XXXX HTOHTO XX 700 - 246 = n

32. Step #4d: Mark out the number of ones. 6 XXXX HTOHTO 700 - 246 = n XX

33. Step #5: How many hundreds do you have left?. XXX 4 4 HTOHTO 700 - 246 = XXX

34. Step #6: How many tens do you have left?. XXX 5 35 HTOHTO 700 - 246 = XXX

35. Step #7: How many ones do you have left?. XXXXX 4 454 HTOHTO XX 700 - 246 =

36. XXXXX 454 HTOHTO XX Congratulations! You have subtracted across zeroes with regrouping! 700 - 246

37. Time for a Quiz 600-333 = n 600 -333

38. To Be Continued...