十以内数的分解（Decomposition of Numbers Within Ten）
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The principle of the mathematical decomposition ruler is the mathematical rounding method, which involves adding and subtracting numbers to form an integer. The mathematical decomposition ruler only requires pulling the upper and lower bars of the ruler, and the answer to the sum of the two numbers will appear in the box. Similarly, to subtract two numbers, simply subtract any number on the ruler from the result in the box to obtain the subtraction result. It is very convenient to use and can also help children who have just started school understand mathematics more vividly.
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