T. Fact Families: Groups A and B 
- 3 + 1 =
4 − 3 =
4 − = 3
1 + 3 = - 6 + 1 =
1 + = 7
7 − = 6
7 − = 1 - 7 − 5 =
7 − = 5
5 + = 7
2 + 5 = - 8 − 1 =
8 − 7 =
7 + = 8
1 + 7 =
Lesson 8
Pattern Block Symmetry
Est. Class Sessions: 2Daily Practice and Problems
Teacher Notes
X
- 3 + 1 =
4
4 − 3 = 1
4 − 1 = 3
1 + 3= 4 - 6 + 1 = 7
1 + 6 = 7
7 − 1 = 6
7 − 6 = 1 - 7 − 5 = 2
7 − 2 = 5
5 + 2 = 7
2 + 5 = 7 - 8 − 1 = 7
8 − 7 = 1
7 + 1 = 8
1 + 7 = 8
Ongoing Assessment
Use DPP item T to assess students' fluency with the addition facts, the related subtraction facts, and finding the unknown for the facts in Groups A and B [E12, E13].