Grade K and up. Ten-frames are 2 x 5 rectangular frames into which counters are placed to illustrate numbers less than or equal to 10. Various arrangements of counters on the ten-frames can be used to prompt different mental images of numbers and different mental strategies for manipulating these numbers, all in association with the numbers’ relationships to 10. Plenty of activities with ten-frames will enable students to automatically think of numbers less than 10 in terms of their relationship to 10, and to build a sound knowledge of the basic addition/subtraction facts for 10 that are an integral part of calculation. Boards can be connected together to represent numbers greater than 10. Includes 4 magnetic boards and 80 pegs (40 blue and 40 red/blue). Suggested activities included.