Lesson 7

Make Connections with Subtraction

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

Discuss when it makes sense to use expanded form or mental math strategies for Question D.

  1. 53 = 50 + 30 = 40 + 13
    36 = 30 +  6  = 30 +  6 
      10 +  7 = 17
  2. 87 = 80 + 7 = 70 + 17
    48 = 40 + 8 = 40 +  8 
    30 +  9 = 39
  3. 62 = 60 + 2 = 50 + 12
    55 = 50 + 5 = 50 +  5 
     7
  4. Possible response: I skip counted from 55 to 60 then added 2 more;
    5 + 2 = 7, so 62 − 55 = 7.

Y. Subtraction Using Expanded Form

Use expanded form to solve. Show your work.

  1. 53 − 36 =
  2. 87 − 48 =
  3. 62 − 55 =
  4. Solve Question C another way.