Who is practising?
Choose a local nickname to keep progress separate. No account is needed.
Use a nickname, not a real student name.
Learn a trick
Multiply by 15
Split ×15 into ×10 and ×5, then combine the two friendly products.
Choose a local nickname to keep progress separate. No account is needed.
Use a nickname, not a real student name.
Learn a trick
Split ×15 into ×10 and ×5, then combine the two friendly products.
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