Using the Number Line for Solving Math Problems
To use the interactive number line for solving simple addition and subtraction problems with answers between 0-10, first set both beads to the left on the zero mark. If your student is solving an addition problem, show him how to hold the left bead with his thumb and index finger so that both beads slide to the right. Count the number of tactile lines until he arrives at the number for the first addend. Leave it at that number. You can encourage the student to read the braille number underneath to ensure he’s at the right spot along the number line. Then slide only the right bead over counting the number of marks along the way. Stop when you’ve counted over the correct number of spaces. Finally, read the number underneath the bead. The number it lands on is the sum!
For subtraction problems, simply slide both beads over to the spot marking the larger number called the minuend that he is subtracting from. Leave the right bead there and then slide the left bead towards the left subtracting the correct number of spaces along the way (the subtrahend). The number he lands on is the answer, which is called the “difference”!
*Note: When sliding the beads, encourage the child to place the fingertip of his index finger on the paper so he can feel the tactile marks as he counts.