Practice mental arithmetic with timed challenges featuring addition, subtraction, and division problems. Learn techniques through structured lessons. Train finger movements and mental calculation skills with interactive exercises.
by Hirokazu Komatsu★ 4.882 ratingsEducationFreeData updated 2026-09-06
Learn basic arithmetic and place value concepts using an interactive simulation. Manipulate beads to perform addition and subtraction. Adjust bead positions for different calculations. View step-by-step guidance for counting and operations.
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