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The purpose of the book «Addition and Subtraction» is to train primary school students to calculate correctly and quickly. The tasks are arranged with gradual complication: first, addition and subtraction exercises within 100, then within 1000. Colourful illustrations and stickers will help you understand the essence of the material and make the learning process fun. The tasks are interesting in their presentation and vary in complexity. For each correctly completed task, the student will receive a corresponding sticker, which they will place in the achievement table. After completing all the exercises and tasks, the child will be able to assess their skill level from "beginner" to "pro" by calculating the points they have scored. We wish you to improve your computing skills to the highest level!