Lesson 6

Workshop: Addition

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

The patterns identified in Problem B will be used to solve problems involving adding 9 in DPP item FF.

  1. Each time 10 is added, the tens digit increases by 1 and the ones digit remains a 5.

    No, you can't stop exactly on 200.
  2. As students count by nines, they are adding nine to the previous number. Each time 9 is added, the number in the ones place decreases by 1 and the number in the 10s place increases by 1 until the number in the ones place reaches 0.

    Then, adding a 9 puts a 9 in the ones place, and the pattern begins again.

    No, you can't stop exactly on 200.

EE. Calculator Counting Starting at 5

Use your calculator to count.

  1. Start at 5 and count by 10s to 200. Count quietly to yourself. Describe any patterns you see. Can you stop exactly on 200?
  2. Start at 5 and count by 9s to 200. Count quietly to yourself. Describe any patterns you see. Can you stop exactly on 200?