Grade 5 (ages 10-11) advanced math crosswords: 18 no-prep worksheets, 108 missing-number puzzles with all four operations and multiplication and division to 144. Built for gifted and enrichment work — answer keys included. The hardest set in the line. Many numbers are hidden, so students combine clues from several equations to crack each grid — real reasoning, not drill. 📦 What's Included18 printable PDF worksheets (6 cross-number puzzles per page)108 cross-number puzzles in totalComplete answe