Lesson 5

Paper-and-Pencil Subtraction:
Expanded Form

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

Have 200 Charts and desk number lines readily available.

Possible responses:

  1. $1.20 or $1.30;
    80¢ + 40¢ = 120¢ or $1.20,
    80¢ + 50¢ = 130¢ or $1.30
  2. $1.65; $1.00 + 65¢ = $1.65
  3. 90¢ or $1.00;
    40¢ + 50¢ = 90¢ or
    50¢ + 50¢ = $1.00
  4. 98¢ is close to $1.00 so I just added 100 + 65 = 165 or $1.65

P. Estimate

About how much is:

  1. 78¢ + 45¢
  2. 98¢ + 65¢
  3. 45¢ + 53¢
  4. Show or tell how you know your estimate for Question B is reasonable.