Book 1 – Numbers 0–20 overview; grouping 10–50 by tens; combining and separating numbers within 10; addition and subtraction within 5; forming shapes with plane figures (tangram); comparing size and length of three objects; telling time – o'clock Book 2 – Numbers 0–50 overview; grouping 60–90 by tens; combining and separating numbers within 10; addition and subtraction within 9; classifying by various conditions; telling time – o'clock Book 3 – Learning numbers 51–60; combining and separating numbers within 10; addition making 10; subtraction from 10; patterns repeating in 2 or 3 units; equal division (1/2, 1/3, 1/4) Book 4 – Learning numbers 61–70; combining and separating numbers within 10; adding and subtracting by 1s and 2s within 10; understanding position; left-right symmetry Book 5 – Learning numbers 71–80; combining and separating numbers within 10; addition and subtraction within 10; patterns repeating in 3 or 4 units; making tables and graphs Book 6 – Review of Books 1–5 Book 7 – Learning numbers 81–90; teen numbers from 10 to 15 plus a number; comparing length and area using tools; telling time – o'clock and half past Book 8 – Learning numbers 91–100; subtraction with a minuend from 10 to 15 minus a number; comparing volume and weight using tools; telling time – half past Book 9 – Addition and subtraction of numbers 10–19; adding and subtracting by tens; shapes of objects according to position Book 10 – Numbers 0–100 overview; addition and subtraction of two-digit numbers within 50 without regrouping, and single-digit numbers; reading a calendar Book 11 – Preparing for elementary school entrance Book 12 – Preparing for elementary school entrance Nuri Curriculum – Nature Exploration Area [Mathematical Inquiry] Understanding basic concepts of numbers and operations - Knows the various meanings of numbers used in daily life. - Understands the relationships of "equal," "more," and "fewer" in concrete quantities. - Counts about ten concrete objects and understands their quantity. Representing the position and direction of space and shapes in various ways - Recognizes the characteristics of basic shapes. - Creates various forms using basic shapes. Basic measurement - Compares length, size, weight, etc. in daily life. Understanding regularity - Notices repeating patterns in everyday surroundings. - Recognizes and imitates repeating patterns. Basic data collection and presentation - Collects necessary information or data. - Classifies data according to one criterion.