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First-year students should write math diary, how to write it, and write ten articles. Just be brief, five or six sentences.
On Tuesday, August 18, 2009, the weather was fine.

Today, I learned simple addition and subtraction calculation, and the calculation speed has improved a lot.

For example: 74-49+5 1. It is observed that this problem is 74 MINUS 49, plus 5 1, which means that 74 has only two more, that is, 74+2=76.

Similarly, 66+27-28. That is, one less than 66, which is exactly 66- 1=65.

Is this calculation simple?

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