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
Double and Halve
Halve one even factor and double the other without changing the product.
Choose a local nickname to keep progress separate. No account is needed.
Use a nickname, not a real student name.
Learn a trick
Halve one even factor and double the other without changing the product.
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