Description Book 1 - Comprehensive 0-20, splitting and combining numbers within 5, top/bottom/middle, comparing the size of three objects, patterns repeating in 2-3 types, various types of classification Book 2 - Ordinal numbers 1-10, splitting and combining numbers within 5, farthest/nearest, comparing the length/height of three objects Book 3 - Comprehensive 0-20, splitting and combining numbers within 9, left/right, comparing the amount of three objects, patterns repeating in 2-3 types Book 4 - Big numbers and small numbers, splitting and combining numbers within 9, solid shapes, patterns repeating in 2-3 types Book 5 - Learning numbers 21-30, splitting and combining 10, parts and wholes, sequencing two events Book 6 - Review of Books 1-5 Book 7 - Comprehensive 0-30, adding numbers within 5, left-right symmetry (dividing in half), classification by various conditions Book 8 - Learning numbers 31-40, subtracting numbers within 5, sequencing 3-4 events, comparing the weight of three objects Book 9 - Adding and subtracting numbers within 5, forming shapes with plane figures, patterns repeating in 2-3 types Book 10 - Learning numbers 41-50, adding and subtracting numbers within 5, patterns repeating in 2-3 types, classification by various conditions Book 11 - Comprehensive 0-50, splitting and combining numbers within 10, adding and subtracting numbers within 5, identifying position, parts and wholes Book 12 - Review of Books 7-11 Nuri Curriculum Nature Exploration Area [Mathematical Inquiry] Learning basic concepts of numbers and operations - Understand the various meanings of numbers used in daily life. - Understand the relationships of "equal," "more," and "less" in quantities of concrete objects. - Count about ten concrete objects and learn about quantity. - Express the position and direction of space and shapes in various ways. - Recognize the characteristics of basic shapes. - Use basic shapes to create various forms. Basic measurement - Compare length, size, weight, etc. in daily life. Understanding patterns - Discover repeating patterns in everyday surroundings. - Recognize and imitate repeating patterns. Basic data collection and presenting results - Collect necessary information or data. - Classify data based on one criterion.