A Book with Math Examples. Math Trainer. ADDING AND SUBTRACTING WITHIN 100

The trainer contains 800 examples of addition and subtraction within 100. With its help, the child will automate the skill of mental calculation, master column addition and subtraction, and gain confidence in their abilities. The tasks have been developed by an elementary school teacher with many years of experience. The trainer will be useful for preschoolers and students in grades 1-2.