Lesson 18 Patterns in Addition

    • Let’s look for and use patterns to help us add within 20.

Warm-up How Many Do You See: More Double 10-frames

How many do you see?
How do you see them?

  1. Double ten frame. 9 red counters. 5 yellow counters.
  2. Two ten frames. Top, 3 counters. Bottom, 9 counters.  
  3. Double ten frame. Red, 8 counters. Yellow, 6 counters.

Activity 1 Expression Match

small group at a table

  1. Take out all the expression cards that have the number 10.

  2. Mix up the rest of the cards.

  3. Pick a card.

  4. Place the card under the expression with 10 that it is equal to.

Activity 2 Compare and Connect: Gallery Walk

Activity 3 Centers: Choice Time

Choose a center.

Shake and Spill

Center activity. Shake and Spill.

Compare

Center. Compare.

Number Puzzles

Center activity. Number Puzzles.

Practice Problem

Problem 1

Select 3 expressions that have the same value as 10 + 3.