500 Math Crossword Puzzles for Kids — Addition & Subtraction, Level 1

500 addition and subtraction cross-number puzzles for Grades K–2 (ages 5–8). Like a crossword, but with numbers: kids fill the blank squares so every equation reads true across and down, building early mental-math fluency with sums to 10. Every puzzle has a QR code — and a searchable ID — to solve and self-check online for free, no app needed. Large-print, 4 puzzles per page, with a complete answer key.