Book with examples in mathematics. Fast calculation

The trainer contains more than 500 examples of all types of arithmetic operations. The child automates the skills of tabular and non-tabular multiplication and division, addition, and subtraction within 100. While completing the tasks, not only are computational skills practiced, but mathematical sharpness is formed, attention is trained, and the child's working memory is developed. The trainer will be useful for elementary school students. More details: https://xn--80agbcqdjc3d.xn--p1ai/tovar/15164808_trenajer-po-matematike-byistryiy-schet-1-4-klassyi-feniks-plus.html