The General Standard for the Font Size and Layout of Primary and Secondary School Textbooks issued by the General Administration of Quality Supervision, Inspection and Quarantine proposes to upgrade the basic font size of primary and secondary school textbooks from 16 to 16.
The standard size of high school textbooks is 16, that is, 2 1cm*29.7cm, which is generally smaller than it, but not larger than it. It's better to have a bigger schoolbag, which is looser. The smaller primary school math book should be 32 kais, which is b5.
a4 size
A4 size: 2 1*29.7cm (not 16cm)
According to the cutting method, it should be 8 fold paper, and A 1 paper should be full open paper.
According to the size, it is slightly larger than the general 16 paper opening.
Generally, 846* 1 194 is used to cut paper. A piece of paper of this size is cut out as 16, so it is called 16.
Reference to the above content: Baidu Encyclopedia -A4 paper