Marilyn burns on ... teaching about elapsed time.MANY TEACHERS ACROSS A RANGE of grade levels ask me about the best way to teach elapsed time e·lapsed time n. The measured duration of an event. Noun 1. elapsed time - the time that elapses while some event is occurring . A perfect springboard for teaching this concept is Before and After: A Book of Nature Timescapes, by Jan Thornill (National Geographic Society National Geographic Society U.S. scientific society founded in 1888 in Washington, D.C., by a small group of eminent explorers and scientists “for the increase and diffusion of geographic knowledge. , 1997). Share the book's beautiful paintings to help students make sense of elapsed time. Then try the activities below to give them hands-on experience with the concept, while integrating math with science. [ILLUSTRATION OMITTED] 1 How Long Is One Minute? Tell students that you will time them for one minute. When you say "start" they will put their heads down heads down - [Sun] Concentrating, usually so heavily and for so long that everything outside the focus area is missed. See also hack mode and larval stage, although this mode is hardly confined to fledgling hackers. . When they think a minute has passed, they raise a hand. (Say "time" when it does.) Next, talk with students about whether one minute seemed long or short, how they decided when to raise a hand, and so on. Try again, this time recording how much time elapses for each child before he or she raises a hand. 2 Drawing Stars. Ask students first to predict how many stars they can draw in a minute, then time them as they do so. Have them circle groups of ten stars to count how many they drew; this reinforces using groups of tens to make sense of larger quantities. Make a class graph of the results. Next, have student pairs time each other as they try other tasks for one minute--writing their names, drawing dollar signs, hopping on one foot, and so on. Have students make a prediction before each task. Later, repeat the tasks for other time increments, such as 10 seconds, half a minute, or two minutes. 3 Make an Elapsed Time Book. Using Before and After as a model, invite students to make a class book of elapsed e·lapse intr.v. e·lapsed, e·laps·ing, e·laps·es To slip by; pass: Weeks elapsed before we could start renovating. n. timescapes. Ask each student to contribute two drawings--a "before" and an "after"--of any scene and representing any increment To add a number to another number. Incrementing a counter means adding 1 to its current value. of time that they choose. [ILLUSTRATION OMITTED] 4 What Time Will it Be? First, decide on an amount of time to elapse e·lapse intr.v. e·lapsed, e·laps·ing, e·laps·es To slip by; pass: Weeks elapsed before we could start renovating. n. , such as 9 or 17 or 32 minutes, then identify a "start time." One way to do this is to check the classroom clock and record on the board what time it will be in three minutes "Three Minutes" is the 46th episode of Lost. It is the twenty-second episode of the second season. The episode was directed by Stephen Williams, and written by Edward Kitsis and Adam Horowitz. It first aired on May 17, 2006 on ABC. . Before this start time, have students calculate what time it will be 9 (or 17 or 32) minutes after that, and also record this time on the board. Then--when the clock reaches the start time--start a small kitchen timer. Continue your regular class lesson until the timer buzzes. Then have students confirm that the clock time is the same as the time on the board. [ILLUSTRATION OMITTED] |
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