Lesson of the Day 77: The Subtraction Strip Board - Mastering Subtraction Facts Through Hands-On Strip Exploration Start here

May 16, 2026 · Lesson

"The hands are the instruments of man's intelligence." — Dr. Maria Montessori If your child has been working with the Addition Strip Board and joyfully building sums by laying colored strips end-to-end, you may already sense what comes next. The child who has discovered that 4 + 5 = 9 …