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Phase 2: Counting & Comparing

Lessons 21-40 · Phase 2 extends counting to 20, introduces number patterns, and builds fluency with number order and comparisons.

Concepts Introduced

SymbolLessonTypeExample
11-1521number rangeeleven through fifteen
16-2026number rangesixteen through twenty
+31symbolplus, add
number line33tool0 to 20 number line

Skills

  • Counting to 20 fluently
  • Counting backward from 10
  • Identifying numbers 11-20
  • Understanding 'one more' and 'one less'
  • Introduction to the plus symbol

Tips for Teachers

The teen numbers (11–19) are notoriously confusing. 'Thirteen' does not obviously connect to '3' and '10'. Spend extra time here. Use tally marks and dot patterns to make it concrete.

What to Expect

By the end of Phase 2, the learner counts to 20, understands number order, and is ready to begin addition.

Lessons in This Phase

21 11 22 12 23 13 24 14 25 15, review 11-15 26 16 27 17 28 18 29 19 30 20, review 16-20 31 plus (+) 32 +1 practice 33 number line 34 number line +1, +2 35 one more, one less 36 counting backward 37 adding to 5 38 review 11-20 39 addition review 40 Phase 2 Review