Lesson 9

Money Problems

Est. Class Sessions: 1–2

Daily Practice and Problems

Teacher Notes
X
  1. 6 +  6 = 12
  2. 14 =  7 + 7
  3. 16 − 8 =  8
  4. 10 + 10 = 20
  5. 7 + 8 = 15
  6. 13 −  6 = 7
  7. 9 + 10 = 19
  8. 15 − 8 =  7
  1. Possible response: I know 8 + 8 = 16 and 15 is one less. If
    7 + 8 = 15 then 15 − 8 = 7.

Ongoing Assessment

Use DPP item FF to assess students’ strategies with the addition facts in Group D [E11] and the related subtraction
facts [E12].

FF. Addition Facts Quiz 2: Group D

  1. 6 + = 12
  2. 14 = + 7
  3. 16 − 8 =
  4. + 10 = 20
  5. 7 + 8 =
  6. 13 − = 7
  7. 9 + = 19
  8. 15 − 8 =
  1. Show or tell how you solved Question H.