Lesson 3

Fair Shares or Not Fair Shares

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

Have 200 Charts readily available. Ask students to solve each problem two different ways. Make sure that mental math strategies are discussed. One possible strategy for each is given.

  1. 110; break the numbers into parts and then add 40 + 60 + 4 + 6 = 100 + 10 = 110.
  2. 51; I was thinking 100 − 50 = 50 and 101 is one more than 100, so the answer is 51.
  3. 98; 184 − 84 = 100 and I need to subtract 2 more.
  4. 200; I thought 175 + 25 which adds 2 to the first addend and takes 2 off the second one, so everything stays the same, and 175 + 25 = 200.

I. More Than One Way

Solve each problem two different ways. Think about making tens.

  1. 44 + 66 = ________
  2. 101 − 50 = ________
  3. 184 − 86 = ________
  4. 173 + 27 = ________