Student Elapsed Time Rulers 10 Set Environmentally friendly Fiber Particulate Composite (FPC) working bell A Visit to the working bell Each of the 81 keys has a math equation on it Elapsed time and duration of time subjects are difficult for students to grasp and digital clocks only make it harder as students are failing to adequately learn to tell time using analog clocksThe Elapsed Time Ruler was created to address this difficulty and help teachers instruct students on elapsed time and duration of time questionsThe student version of the Elapsed Time Ruler is designed to interlock at each side marked "midnight" to create one continuous time lineStudent version is laminated on the front to allow the use of dry erase markers to mark the beginning and ending times if neededThink of this time tool as an analog clock unwound into a 24 hour format with A marked in red and P