27:37
Lesson 1, Grade 4-2: Addition and Subtraction of Fractions
강쌤수학학원
23:27
초4-2 1단원 분수의 덧셈과 뺄셈(1)
36:25
4th grade, Unit 1, Addition and Subtraction of Fractions (2)
22:51
Lesson 2, 4th grade, Triangles
29:24
초4-2 제3강 소수의 덧셈과 뺄셈
31:20
초4-2 제4강 사각형
21:37
Lesson 5, 4th Grade, 2nd Grade, Broken Line Graph
30:04
Lesson 6, Polygons, Grade 4-2
