Description

Show base-10 blocks for the minuend (e.g., 62 = 6 rods + 2 cubes). Problem: 62-35. Student sees they need to remove 5 cubes but only have 2. They click a rod to break it: it animates splitting into 10 cubes (now: 5 rods + 12 cubes). Then they click to remove cubes (5 cubes removed → 7 remain). Then

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