なんでんたく｜計算がすきになる電卓

The "Why?" calculator that turns children's "I get it!" into "I understand!" - the Nande Dentaku.

Even without parental instruction, children can find the reason for the answer themselves, making them increasingly fond of math.

◆ The "Why?" button explains the reason for the answer

Simply press "Why?" after calculating.

Cute illustrations and simple language clearly explain the reason for the answer.

For example, after the answer "3 + 5 = 8," pressing "Why?" will show an illustration explaining, "There were 3 apples, and then 5 more came later, so there are 8 in total."

Parents who previously struggled to answer "Hey, why?" will now find that their children will find the answer themselves.

◆ A "card picture book" that makes math fun while playing

Includes a collection element where children earn cards for successful calculations.

The fun of collecting cards from various genres such as animals, fruits, and vehicles will naturally lead to a desire to "try another problem!" More cards will be added in future updates.

◆ User-friendly design that even children can use independently
- Large buttons and all-hiragana display make it easy for preschoolers to operate
- Switch between "Small Mode (Easy)" and "Large Mode (More Dark Numbers)" according to age
- Parental control settings gate protects against children changing settings without permission
- Easy-to-tap layout and user interface designed to minimize accidental operation

◆ Child-friendly design that parents can confidently give to their children
- No account registration or login required. Ready to use immediately
- Learning progress is saved only on the device. No external transmission
• Ads are set to be child-friendly (non-personalized, all-ages content only)
• No personal information such as name, email, or location information is collected.

◆ Recommended for these families:
• Families who find it difficult to answer "Hey, why?" every time.
• Parents who want their children to enjoy math.
• Those looking for a fun learning tool that can be used during short breaks between school and daycare.
• Those looking for an app that allows children to become familiar with calculations in a game-like way, unlike homework or drills.

◆ Target Age
Around 5 years old to early elementary school (children who have started learning addition and subtraction)

Let Nandentaku help your child experience more and more "I understand!" moments every day!