34 boxes of chocolates were sold, 10 boxes of chocolates were sold less than biscuits. In order to calculate how many boxes of biscuits are sold, this problem involves a simple addition operation. Chocolate is sold less than cookies 10 boxes, which means cookies are sold more than chocolate 10 boxes. 10 plus 34 is the number of boxes sold, which means that 44 boxes of biscuits were sold.

Primary school mathematics is to teach children a series of knowledge about numbers, four operations, formulas for calculating figures and lengths, unit conversion and so on through textbooks. Judging from the mathematics learning psychology of primary school students, the learning process of students is not a passive absorption process, but a reconstruction process based on existing knowledge and experience. Therefore, learning while doing and learning while playing will make children learn more actively. From our educational goal, while imparting knowledge, we should pay more attention to cultivating students' comprehensive ability of observation, analysis and application.