Challenge 4th Grade A set of two 100-point problem books that support learning with various question formats. April-July issue, 116 pages total 16 pages of Japanese language problems have been written on and marked. The remaining 100 pages are blank. September-February issue, 164 pages total 4 pages of Japanese language problems and 5 pages of math problems have been written on and marked. The remaining 155 pages are blank. With color diagrams and illustrations, it's easy to understand! Thank you for looking.