Count on the Numberblocks One to Twenty to help little ones learn how to sequence numbers in the right order. There are 10 double-sided Numberblocks jigsaw puzzles featuring the friendly Numberblocks One to Twenty. There are 4 each for 15 and 110, and 2 for numbers 120. Each Numberblocks puzzle is colour-coded, and features a number line, which helps children compare numbers as they order them in the correct sequence. Perfect for learning through puzzle play at home or in the classroom!