Book:-These engaging activities use the 100-bead Rekenrek to extend students' understanding of counting, place value, the four operations, and algebraic thinking. Students will make groups of tens and ones, add and subtract within 100, explore multiplication and more. Each of the 24 lessons is correlated to current standards and includes instructions, assessment questions and blackline masters. Grades 1-3.Group Set:-This set includes 10 student wooden 100-Bead Rekenreks as well as a copy of our activity book - Working with the 100-Bead Rekenrek.