Mathematical decomposition ruler, just pull the upper and lower bars of the ruler, and the answer of adding two numbers will appear in the box. Similarly, two numbers need to be subtracted. As long as you subtract any number above or below the ruler from the number in the box, you can get the subtraction result. It is very convenient to use, and it can also make children who just go to school understand mathematics more vividly.
Using the mathematical decomposition ruler can not only help us understand the mathematical addition and subtraction more vividly, but also be used as a basic tool for fast calculation. The concrete principle of mathematical rounding method is to add and subtract numbers to make them into integers, which makes the calculation of numbers simpler and faster.
Advantages:
For students who have difficulties in math learning, the math decomposition ruler can remember math addition and subtraction more vividly. After fully mastering the addition and subtraction within 10, they can calculate without using the mathematical decomposition ruler.
Mathematical decomposition ruler is not only an artifact to learn rounding, but also an artifact to learn addition and subtraction within 10. Just drag the decomposition ruler and you can get the answer quickly. It is one of the most useful tools for learning mathematics, and it is worth having for students studying basic computing.