As children fit together our equivalency puzzles, they practice place value to the thousands in 4 different ways. Each self correcting puzzle has 4 simple pieces kids just choose a large puzzle piece showing a 3- or 4-digit number then connect 3 corresponding pieces that express the same value in expanded form, word form and place value blocks! You get 12 puzzles and an activity guide. Puzzles measure 12.7 cm x 15.24 cm