: Developing strategies for addition and subtraction, including "making a ten" and using number lines.
The by T.E. Demidova , S.A. Kozlova , and A.P. Tonkikh is a foundational workbook used in the Russian educational system (often under the "School 2100" program) to teach first-grade students essential mathematical concepts. rabochaia tetrad po matematike 1 klass demidova otvety
: Introduction to "parts and wholes" through number bonds and solving simple word problems. rabochaia tetrad po matematike 1 klass demidova otvety