Lesson 9

Composing and Decomposing Shapes

Est. Class Sessions: 1

Daily Practice and Problems

Teacher Notes
X
  1. 4
  2. 9
  3. 9
  4. 9
  5. 10
  6. 8
  7. 10
  8. 1
  9. 5
  10. 2
  11. 5
  12. 5
  13. 7
  14. 4
  15. 3
  16. 8
  17. 3
  18. 10
  1. Strategies will vary. Possible response: 9 + 5 = 14, so 14 − 9 = 5

Ongoing Assessment

Use DPP item Y to assess students' abilities to determine the unknown number in an addition or subtraction sentence involving three whole numbers for the facts in Group E [E11].

Y. Subtraction Facts Quiz: Group E

  1. 12 − 8 =
  2. 13 − 4 =
  3. = 12 − 3
  4. = 14 − 5
  5. = 12 − 2
  6. 13 − 5 =
  7. = 11 − 1
  8. 11 − 10 =
  9. 14 − 9 =
  10. 12 − 10 =
  11. = 13 − 8
  12. 12 − 7 =
  13. 12 − 5 =
  14. = 13 − 9
  15. 13 − 10 =
  16. 12 − 4 =
  17. = 12 − 9
  18. 13 − 3 =
  1. Explain how you solved problem I.