Volume 1 - One-to-one correspondence, Learning numbers 1-3, Up/Down, Parts and Whole, Comparing size/length of two objects Volume 2 - One-to-one correspondence, Learning numbers 1-5, Front/Back, Comparing height of two objects, Sorting by color/shape Volume 3 - Review of 1-5, Open/Closed, Inside/Outside, Parts and Whole, Comparing height of two objects Volume 4 - Learning numbers 6-9, Up/Down/Middle, Front/Back/Middle, Plane shapes (circle, triangle, square), Sorting by type Volume 5 - Review of 1-9, Parts and Whole, Sorting by type Volume 6 - Review of Volumes 1-5 Volume 7 - Learning 0 and 10, Review of 0-10, Sorting by use, Parts and Whole Volume 8 - Review of 0-10, Decomposing 2-4, Far/Near, Patterns with 2 repeating elements Volume 9 - Learning numbers 11-15, Composing 2-4, Very Top/Bottom, Very Front/Back, Comparing quantity of two objects Volume 10 - Learning numbers 16-20, Decomposing and composing 5, Patterns with 3 repeating elements, Comparing weight of two objects Volume 11 - Review of 0-20, Decomposing and composing 2-5, Comparing depth/height/thickness/width of two objects Volume 12 - Review of Volumes 7-11 Perfect preparation not only for the Nuri Curriculum but also for entering elementary school! This series is designed for systematic learning, reflecting the detailed contents of the Natural Exploration area set by the Nuri Curriculum as well as the elementary education curriculum. Nuri Curriculum Natural Exploration Area [Mathematical Inquiry] - Learning the basic concepts of numbers and operations - Understanding the various meanings of numbers used in daily life. - Understanding the relationships of "equal," "more," and "fewer" among concrete quantities. - Counting about ten concrete objects and understanding their quantity. - Expressing the position and direction of space and shapes in various ways. - Recognizing the characteristics of basic shapes....