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 5" x 6".