A thorough understanding of the base-ten number system is one of the critical building blocks for developing computational fluency. Place Value Trains demonstrate that the four digits of a four-digit number represent amounts of thousands, hundreds, tens, and ones; e.g., 3,064 equals 3 thousands, 0 hundreds, 6 tens, and 4 ones. Use alone or with base ten blocks (sold separately) to model numbers to the thousands place. Place Value Train Cards form a useful transition between base ten blocks and written numerals. Similar to arrow cards, a set of place value cards with an " arrow" or point on the right side, Place Value Trains help students organize the cards horizontally or vertically to represent numbers in expanded notation. Overlap the cards or line up the train engine to form multi-digit numbers. Contains 37 demonstration-sized train cards printed 0-9, 10-90, 100-900, and 1000-9000. Longest card measures 15" x 2.75" .