Math diary's writing style should be the same as his usual diary, with the same format, focusing only on mathematics learning. For example: the time is 20 19-7-20, and the weather is fine (the first line can be written in the top box or after the bar).

Text (blank two spaces at the beginning, then write the text) 125× 63× 8 =, according to the original algorithm. Use 125×63. By exchanging 8 and 63 by the commutative law of multiplication, we can first calculate 125× 8 = 1000. Then use 1000× 63 = 63000.

To improve the calculation of this problem, we should remember several formulas that are multiplied into integers, such as125× 8 =1000; 25× 4 = 100 and so on. We should use the commutative law of multiplication flexibly and combine them.

Matters needing attention in expanding data

First, the most important thing in keeping a diary is to seek truth from facts, not to make fiction and not to exaggerate facts.

Second, the forms are diverse, not too single, otherwise the content will be boring, and the math diary arranged by the teacher will lose its original meaning.

Third, the language should be as concise as possible without nonsense.