How to make a four-level digital turntable?

The fourth digital dial is made as follows:

1. Preparation materials: cardboard, scissors, pencils, compasses, rulers, thumbtacks, fan-shaped templates, rotatable cardboard trays, and silk ropes.

2. Making the tray body: draw a circle with a diameter of 10cm on the cardboard with a compass, and cut it out to become the tray body.

3. Making dial: draw a dial on the cardboard with a fan-shaped template, the size of which is the same as that of the tray body, and connect the dial and the tray body with pushpins.

4. Making a rotatable cardboard disc: draw a circle with a diameter of 8cm on the cardboard with a compass, cut it out to become a rotatable cardboard disc, and then mark the number 1-9 on the disc.

Digital turntable is a set of teaching toys in the field of mathematics, which can let children know the number of 1-9 and perform simple mathematical operations, such as addition and subtraction. In addition, the digital turntable can also help children develop logical thinking ability, observation ability and hands-on ability. At the same time, the self-made digital turntable also has the characteristics of environmental protection, which can avoid wasting too much resources.

Benefits of digital turntable

1, randomness: the number dial can provide real randomness, ensuring that every number has an equal chance to be selected. This is very important for lottery, decision-making or random assignment of tasks, and avoids subjective interference and preference.

2. Fairness: The randomness of the digital turntable can ensure that each participant enjoys a fair chance in the lottery or decision-making process. No matter whether it is awarding prizes or selecting candidates, every number has equal possibility, and there will be no bias towards any party or unfair treatment.

3, simple and easy to use: digital dial usually adopts intuitive interface design, simple operation, easy to use. Just enter or set a randomly selected number range, and click the turn button to get the result, which saves the tedious manual shaking number or calculation process.

4. Diversity: Digital turntable can adapt to various scenes and needs. Whether it is the roll call in education, the lucky draw in business activities or the task assignment in team work, the digital turntable can be flexibly applied.