About Cross Sums
Cross Sums, also called Kakuro, is a crossword puzzle made of numbers. Instead of words, every row and column of white squares must add up to the clue in the dark square next to it, using the digits 1 to 9 and never the same digit twice in one run.
A clue above the diagonal line is the sum of the white squares to its right, and a clue below the line is the sum of the squares underneath. There are 60 puzzles in five packs, from tiny 3 by 3 boards to 6 by 6 expert boards, and every one has exactly one answer.
It is wonderful practice for adding up and number facts. Some sums can only be made one way, like 3 in two squares (1 and 2) or 17 in two squares (8 and 9), and spotting them is the key to every puzzle. Pencil notes, green and red clues and hints help along the way.
Best for ages 8+
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