Lesson 2

Strategies for Making Tens

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

Ask students to work on the problems in pairs and to be prepared to show or tell how they decided which are true and which are false. Some students may need to find the sum on both sides. Other students may be able to use reasoning similar to the following for C: If you split 7 into 1 and 6, then 9 + 7 is the same as 9 + 1 + 6.
  1. True
  2. False
  3. True
  4. True
  5. False
  6. True

G. True or False

Decide if each number sentence is true or false. Be ready to explain your thinking.

  1. 13 = 9 + 4

    ____________
  2. 9 + 8 = 18

    ____________
  3. 9 + 7 = 9 + 1 + 6

    ____________
  4. 8 + 8 = 9 + 7

    ____________
  5. 6 + 9 = 7 + 7

    ____________
  6. 6 + 9 = 5 + 10

    ____________