These Crossword Math mental arithmetic puzzle books are cram packed full of hundreds of interesting and fun number puzzle grids.
How it works
Study the grid of interconnecting sums on each Crossword Math puzzle. Solve each individual sum in the grid to find the missing numbers. Complete the entire grid, solving each sum as you go.
When you’ve completed the entire grid, use the highlighted numbers to solve the bonus sum underneath.
Each book comes full of dozens of Crossword Math puzzle grids as well as a host of other fun puzzles and games for hours of fun.