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Math - Tricky Teens Introductory Lesson

Grade Level:
1
Subject:
Math
Topic:
Tricky Teens
Objective:
By the end of this lesson, students will gain an understanding of teen numbers 11-19 and how they relate to 10.
Prep:
Write teen numbers on board with "1" a different colour than all the rest to differentiate tens from ones.
Materials:
Ten frames, 19 counters in individual cups x 12, index cards with numbers written on them, "Counting to 20" worksheet and "Numbers to 20" worksheet.