* gecKo mathematics* is a system based on the English translations of a Korean arithmetic
series used for grades 1-6 in the national curriculum of Korea in 1993-1996. The translations were
produced with permission from the Korean Ministry of Education, and with funding from the National
Science Foundation.

### Block Learning and Conceptualization: Foundations of **gecKo mathematics**

**gecKo mathematics**

In * gecKo mathematics*, constructs are built on a foundation of blocks. As each function is
introduced, its relation to previously learned mathematics functions is developed. Concepts are
developed in-depth all in one place. Procedures are tied to the underlying mathematical principles.

For example, division is learned in Grade 2-2. During this lesson, the previously learned concepts of dividing into equal parts and repeated subtraction are used to develop a focus on the inverse relationship between multiplication and division.

View a Sample Block Learning Lesson tied to the underlying principle of the inverse relationship between multiplication and division.

### Teacher's Manuals

Each level of * gecKo mathematics* contains a concise manual to guide teachers through 9 or
10 units of instruction on the same 5 domains recommended by the NCTM as important school content. Each unit
or chapter in

*contains 6 to 10 fully developed lessons.*

**gecKo mathematics**- Outline of the chapter
- Study Sequence
- Chapter Goals
- Development Plan
- Evaluation Notes
- Text Study: a mathematically rich guide which reviews the concepts contained in the chapter at a more theoretical level than is found in the student texts.
- Detailed development of the 6 to 9 lessons in the unit.