The phrase represents a resource that provides solutions to supplementary exercises. These exercises, typically numbered 1 through 4, are designed to offer students or learners extra opportunities to reinforce and apply concepts learned in a specific lesson or module. For example, a textbook chapter on algebra might include four supplementary practice problems, and this resource offers the verified solutions to those problems.
Access to verified solutions for these additional exercises provides several benefits. It enables learners to self-assess their understanding and identify areas where they need further assistance. It also offers a valuable tool for teachers and instructors, who can use it to confirm the accuracy of student work and efficiently address any misconceptions. Historically, such resources were found in teacher’s editions or solution manuals, but are now increasingly accessible online or through digital learning platforms.