MATH-IN-CTE TECHNICAL ASSISTANCE Math-in-CTE Lesson Plan Lesson Title: The 24 Hour Clock Author(s): Lyn Gray, RN & Jeanie Wilson, RN Matthew Hagen Phone Number(s): 503-353-5920 Lesson # 1 E-mail Address(es): [email protected] [email protected] [email protected] Occupational Area: Health Services-Registered Nurses Trends in Healthcare CTE Concept(s): Units of Time/Military Time CTE Standard: HSZ01.01.03.03 Record time using 24-hour clock Math Concepts: Simple Conversions, Reading and using tools of measurement, Modular Arithmetic Common Core SS Math Standard: Tell and write time. 1.MD.3. Tell and write time in hours and half-hours using analog and digital clocks. Work with time and money. 2.MD.7. Tell and write time from analog and digital clocks to the nearest five minutes, using a.m. and p.m. Represent and solve problems involving addition and subtraction. 2.OA.1. Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. Create equations that describe numbers or relationships. A-CED.1. Create equations and inequalities in one variable and use them to solve problems. Include equations arising from linear and quadratic functions, and simple rational and exponential functions. MATH-IN-CTE TECHNICAL ASSISTANCE Lesson Objective: Students will be able to……. 1. Express time using the 24-hour military clock. Materials: Handouts/powerpoint THE "7 ELEMENTS" TEACHER NOTES (and answer key) 1. Introduce the CTE lesson. You are a scrub tech working on call at Sabin Schellenberg Health Sciences Hospital. A patient was in a bad car accident and has fractured his leg. A surgical procedure to repair the fracture has been scheduled for 6 o’clock. What time do you arrive at the hospital? This scenario will be on posted on the powerpoint that is used as a daily “STAT” or warm up activity. History of Military Time: To avoid confusion the military must communicate with bases and personnel located in other time zones. They use the time in Greenwich, England, which is commonly called, Greenwich Mean Time (GMT). Write down ideas about how you arrived at your decision. 2. Assess students’ math awareness as it relates to the CTE lesson. Conversation about how they came to the conclusion. Military time is used to AVOID mistakes in healthcare. If a.m. or p.m. is omitted or misread, than an error of 12 hours is made. 3. Work through the math example embedded Mathematical equation: in the CTE lesson. 1200 + x =1800 6 o’clock is not an acceptable way to express -1200 -1200 time in healthcare. X= 600 6 a.m.: 0600 6 p.m.: 1800 An easy way to convert the pm time is to add the time to 1200. Example: 1200 + 0600= 1800 Do not have to have students use the above equation. As it relates to math this is the way to set up an equation. The idea is the student can write an equation to represent or model a real life situation. Most students will be able to do the example in their heads. MATH-IN-CTE TECHNICAL ASSISTANCE 4. Work through related, contextual math-in- Give students time to work through the question. On white board write out the times CTE examples. as the students know them. ie: 7:30am-4:00pm Day Shift You have just accepted a position as a CNA at a nursing home. The schedules you have been given for the shifts include: 3:30pm-12:00am Evening Shift 11:30pm-7:30am Night Shift 0730-1600 Day Shift To convert the times to the 24 hour clock do these calculations for the afternoon times. 1530-2400 Eve Shift Add the afternoon times to 1200. 2330-0800 Night Shift 1200 + 0400= 1600 If you are assigned to the evening shift what time 1200 + 0330= 1530 will you begin your shift and when will your shift 1200 + 1130= 2330 end? What time might you take your “lunch Or subtract 1200 from the military time. hour”? 1600 - 1200= 4pm 1530 -1200= 3:30pm 2330 -1200= 11:30pm Discuss with student when times are verbalized, there is a specific way in which they are expressed: 1600= Sixteen hundred hours 1530=Fifteen thirty hours 2330=twenty-three thirty hours 5. Work through traditional math examples. Reading a tool of measurement, addition and subtraction Worksheet titled, “Military Time”, Reading and Using the 24 hour clock. Students to work through 35 questions. Give students 10-15 minutes to work through worksheet. Go over answers on the worksheet and address any questions students have. Ask, was there any areas that were harder to answer. MATH-IN-CTE TECHNICAL ASSISTANCE 6. Students demonstrate their understanding. Ask randomly what time it is. Informal check in with students. What is the current time? What time does school end? 7. Formal assessment. Question: Maria is working in the hospital. When taking vital signs, she discovers the patient has a temperature. When she checks the orders, she finds the physician has ordered Tylenol to be given every four hours. Maria notes it is 8:30 p.m. and the last dose was given to the patient was charted at 1730 hours. Maria gives the patient 2 tablets and charts the time given at 2130. First: Write an equation that converts standard time into military time. This question will be posted the next day for the Stat (warm up). Answer to question: Figure out the time in 24 hour times. 1200+830=X X= 2030 Current time in problem was 2030 Last dose was given at 1730 So……..2030-1730= 0300 hours Medication was to be given every 4 hours She gave the patient the medication 1 hour too early because she noted the 24 hour time Assuming the last dose was given at 1730 incorrectly (2130). hours, when would the next dose of Tylenol be due? Then answer the following: If it is now 8:30 p.m., how much time has NOTE: This is not meant to be difficult. Write an easy equation. elapsed since the medication was given? Did Maria note the time correctly? If not, how is 8:30 p.m. expressed in military time? Name: Date: Military Time: “Military Time” Reading and Using the 24‐hr Clock The 24‐hour clock, or military time, has been used for decades in the medical field as a concise method of demonstrating time. This method begins at midnight, or 0000 hour, and runs consecutively until 2359. This method uses a special two‐digit system so a.m. and p.m. are not needed. Military time is used to eliminate the confusion regarding time of day for medical records. The following chart shows the comparison between Standard and Military time. Standard Time Military Time Standard Time Military Time Midnight 0000 Noon 1200 1:00 a.m. 0100 1:00 p.m. 1300 2:00 a.m. 0200 2:00 p.m. 1400 3:00 a.m. 0300 3:00 p.m. 1500 4:00 a.m. 0400 4:00 p.m. 1600 5:00 a.m. 0500 5:00 p.m. 1700 6:00 a.m. 0600 6:00 p.m. 1800 7:00 a.m. 0700 7:00 p.m. 1900 8:00 a.m. 0800 8:00 p.m. 2000 9:00 a.m. 0900 9:00 p.m. 2100 10:00 a.m. 1000 10:00 p.m. 2200 11:00 a.m. 1100 11:00 p.m. 2300 You try …… Inner circle: Before Noon What does your answer depend on? What numbers could you use for midnight? What time is it? Outer Circle: After Noon Name: Date: Military Time: 24‐Hour Clock Convert the following times: Standard Military 1 1:15 am 2 2:35 pm 3 1210 4 2:45 am 5 0414 6 1800 7 8:25 am 8 11:30 pm 9 12:00 pm 10 0110 11 3:25 pm 12 9:15 pm 13 2125 14 1505 15 10:40 pm 16 2400 17 11:35 am 18 8:55 pm 19 2300 20 0845 Name: Date: Military Time: