'“Workbook for Money to Learn How to Spend and Calculate Money” is a hit for parents who want to teach their children how to spend money even if the trend toward cashless payment is progressing. With the second “Shopping Edition,”the cumulative sales of the series exceeded 250,000 copies, with the help of the “Financial Education for Children” which was featured on TV and other media. “Science” and “Programming” in the series are also popular, as these educational materials are unique to Gakken that are not available in other companies.