Plus or Minus is a puzzle to help children master the
skills of addition and subtraction. Numbers are
arranged in a 5 x 5 grid. The columns add up to the
answers at the bottom, and the rows add up to the
answers on the right. The bottom row, the right-hand
column, and the diagonal all add up to the answer in
the bottom right-hand corner, which is left blank.
Children must place a plus or a minus sign in front
of each number to make sure everything adds up
correctly. There are three books of sixty puzzles
To buy on Amazon, click here.
The puzzles exist as Kindle ebooks, but work better
Math Puzzles: Plus or Minus