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Lucky 7 Subtraction

Lucky 7 Subtraction. Created by V. S. Bell H. H. Beam Elementary School Gastonia, NC 28052. Let’s subtract!. Lucky 7 Subtraction. Subtract means to take away!. Use the EOG grid paper for student work. Ask students to practice along with the PowerPoint.

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Lucky 7 Subtraction

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  1. Lucky 7 Subtraction Created by V. S. Bell H. H. Beam Elementary School Gastonia, NC 28052

  2. Let’s subtract! Lucky 7 Subtraction 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! • How many more? • How many left? • Difference? • Have left? Subtract means to take away!

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

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

  7. Step #1. Show how many you have in the beginning. 500 X X X X X H T O 500 - 137 = n

  8. Step #2. Subtract the number of hundreds. 1 X X X X X H T O 500 - 137 = n

  9. Step #2. Subtract the number of hundreds. 1 X X X X X H T O 500 - 137 = n

  10. Step #3a: Subtract the number of tens. X X X X X H T O 3 500 - 137 = n

  11. Step #3b: Are there any tens showing? X X X X X H T O NO! Please regroup! 500 - 137 = n

  12. Step #3c: Circle one hundred and draw marks for 10 tens? X X X X X X H T O 500 - 137 = n

  13. Step #3d: Mark out the number of tens? X X X X X X H T O 3 500 - 137 = n

  14. Step #4a: Subtract the number of ones? X X X X X X H T O 7 500 - 137 = n

  15. Step #4b: Are there any ones showing? X X X X X X H T O NO! Please regroup! 500 - 137 = n

  16. Step #4c: Circle 1 ten and make marks for 10 ones. X X X X X X H T O 500 - 137 = n

  17. Step #4d: Mark out the number of ones. X X X X X X H T O 7 500 - 137 = n

  18. Step #5: How many hundreds do you have left?. 3 X X X X X X H T O 3 500 - 137 =

  19. Step #6: How many tens do you have left?. X X X X X X H T O 6 3 6 500 - 137 =

  20. Step #7: How many ones do you have left?. X X X X X X H T O 3 3 6 3 500 - 137 =

  21. Congratulations! You have subtracted across zeroes with regrouping! X X X X X X H T O 500 - 137 3 6 3

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

  23. Step #1. Show how many you have in the beginning. 700 X X X X X X X H T O 700 - 246 = n

  24. Step #2. Subtract the number of hundreds. 2 X X X X X X X H T O 700 - 246 = n

  25. Step #3a: Subtract the number of tens. X X X X X X X H T O 4 700 - 246 = n

  26. Step #3b: Are there any tens showing? X X X X X X X H T O NO! Please regroup! 700 - 246 = n

  27. Step #3c: Circle one hundred and draw marks for 10 tens? X X X X X X X X H T O 700 - 246 = n

  28. Step #3d: Mark out the number of tens? X X X X X X X X H T O 4 700 - 246 = n

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

  30. Step #4b: Are there any ones showing? X X X X X X H T O NO! Please regroup! 700 - 246 = n

  31. Step #4c: Circle 1 ten and make marks for 10 ones. X X X X X X H T O 700 - 246 = n

  32. Step #4d: Mark out the number of ones. X X X X X X H T O 6 700 - 246 = n

  33. Step #5: How many hundreds do you have left?. 4 X X X X X X H T O 4 700 - 246 =

  34. Step #6: How many tens do you have left?. X X X X X X H T O 5 3 5 700 - 246 =

  35. Step #7: How many ones do you have left?. X X X X X X X H T O 4 4 5 4 700 - 246 =

  36. Congratulations! You have subtracted across zeroes with regrouping! X X X X X X X H T O 700 - 246 4 5 4

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

  38. To Be Continued . . .

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