For the textbook by (often associated with the Vinogradova program), the following sites offer comprehensive answer keys:
: Identifying points, lines, planes, and calculating the perimeter and area of shapes. Tips for Using GDZ Effectively 4th grade math | Khan Academy skachat gdz po matematike vinogradovoi 4 klass
: Reading, writing, and comparing numbers up to 1,000,000. For the textbook by (often associated with the
: Mastering addition, subtraction, multiplication, and division with large numbers. and comparing numbers up to 1
