Lesson 2

Introduce Coordinates

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

  1. 631
  2. 282
  3. 1021
  4. 155
  5. 7824
  6. 3565
  1. Possible response: I rounded 4057 to 4000 and 492 to 500. Then I subtracted 4000 − 500 = 3500. Since 3500 is very close to 3565, I know my answer is reasonable.

C. Practice Addition and Subtraction

Use your Addition Strategies Menu and Subtraction Strategies Menu in the Student Guide Reference section to choose a strategy to solve each problem.

  1. 549 + 82 = _________
  2. 629 − 347 = _________
  3. 843 + 178 = _________
  4. 213 − 58 = _________
  5. 7542 + 282 = _________
  6. 4057 − 492 = _________
  1. Show or tell how you can use estimation to show that your answer to Question F is reasonable.