Lesson 6

Elapsed Time

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

Use DPP item S to practice the addition facts in Group F and the related subtraction facts. Students will need connecting cubes and number lines readily available.

  1. 15 dogs; 9 + 6 = 15
  2. 17 dogs
    Possible strategy:
    15 − 5 = 10
    10 + 7 = 17

S. At the Dog Park

  1. Richard was at the dog park and saw 9 brown dogs and 6 black dogs. How many dogs did he see altogether?
    2. Number sentence _______________________________________________________


  2. By the time Richard left the dog park, 5 dogs had gone and 7 more had come. How many dogs were at the park when Richard left? Show or tell how you know.