Lesson 7

Problem Solving with Volume

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

Students should be ready to defend their answers.

  1. 3 digits
  2. 4 digits
  3. 3 digits
  4. 4 digits
  5. 4 digits
  6. Possible response: 5 × 500 = 2500 and 5 × 20 is just another hundred, so it's 4 digits.

AA. Estimating Answer Size

Without solving these problems on paper, name the number of digits in the answer.

  1. 112 + 658
  2. 122 + 967
  3. 1221 − 345
  4. 3042 − 1132
  5. 5 × 520
  1. Show or tell how you found your answer for Question E.