S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Revision of Level Time Calculating Distance Time Distance Speed Calculating Speed Calculating Time Mixed Problems Time – Distance Graphs Time Difference ( Counting Method)

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 2.Convert 24hr to 12hr clock. 1.To revise previous Time work. Time Revision of Time 1.Convert 12hr to 24hr clock. 3.Count Method to find time intervals.

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 2.Change from 24 to 12 hour clock. 1.To revise Level D work on converting between 12 and 24 hr clock and vice versa. Revision on Time 1.Change from 12 to 24 hour clock. Converting Time

5-Aug-15Created by Mr. Lafferty Maths Dept pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 12/24 Hour Clock To go from 12 hour clock to 24 hour clock just add 12 to the pm hours: Examples 8 pm becomes 9 pm becomes 6:30 pm becomes 11:30 pm becomes 4:20 pm becomes 3:10 pm becomes 1510

5-Aug-15Created by Mr. Lafferty Maths Dept pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 12/24 Hour Clock To go from 24 hour clock to 12 hour clock just subtract 12 from the hours if it is greater than 12: 8 pm 9 pm 5:30 pm 10:08 pm 8:06 pm Examples 2000 becomes 2100 becomes 1730 becomes 2208 becomes 2006 becomes 1350 becomes 1:50 pm

greater than 12 subtract 12 Let’s make up our own questions ! 5-Aug-15Created by Mr.Lafferty Maths Dept S3 General Converting Time Key Points 12 hour clock Analogue clock ALWAYS use AM or PM 24 hour clock Digital clock NEVER use AM or PM pm times add on 12 ALWAYS 4 digits Hours Hours

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 1 Ch10 (page 108) Time Revision of Time

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions A TW

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 2.Find time differences between two times, showing all working. 1.To explain the counting method to find the difference between two times. 1.Understand the counting method. Counting Method

5-Aug-15Created by Mr.Lafferty Maths Dept Level D Counting Method When working out time difference we will use the Counting Method. This method will always work. Example : Find the time difference between hrs and hrs HrsMins nearest hour What’s left hours 20 mins2 hrs10 mins

A bus leaves Kirkintilloch Main Street at hrs and arrives in Aberdeen at hrs. How long was the journey. 5-Aug-15Created by Mr.Lafferty Maths Dept Level D Counting Method HrsMins nearest hour What’s left hours 20 mins3 hrs50 mins But there are 60 minutes = 1hour 70 mins = 1hr 10mins 4hrs 10 mins

Using Timetables Until Hour Every And Glasgow Bus Station George Square Port Dundas Springburn Milton Bishopbriggs Kirkie Bus Station * * * How long does the first bus take from Kirkie to Glasgow HrsMins nearest hour What’s left hours 35 mins0 hrs14 mins

Let’s make up our own question ! The key steps are left on the slide to help you. 5-Aug-15Created by Mr.Lafferty Maths Dept Level D Counting Method HrsMins nearest hour What’s left + hours mins hrs mins But there are 60 minutes = 1hour

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 2 Ch10 (page 109) Time Revision of Level D/E

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions 4x 6x 120 o 70 o 4x

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 1.Know the distance formula. 1. To explain how to work out simple distance calculations using the distance formula. Distance Working Out Distance 2.Use the formula to work out simply distance calculations.

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Distance Working out Distances Imagine you were travelling in a train at a steady speed of 80km/hr. In 1 hour you travel :80 x 1 = 80 km In 2 hours you travel :80 x 2 = 160 km In 3 hours you travel :80 x 3 = 240 km Can you guess what the formula is : in symbols

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 3 Ch10 (page 110) Distance Working Out Distance

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 1.Know the speed formula. 1. To explain how to work out simple speed calculations using the speed formula. Speed Working Out Speed 2.Use the formula to work out simple speed calculations.

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Speed Working Out Speed Imagine you sailed 45 kilometres between two islands and it took 3 hours. In 3 hours you travel := 45 km In 1 hour you travel : 45 ÷ 3 = 15 km This means your speed is :15km/hr Can you guess what the formula is : in symbols

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 4 Ch10 (page 112) Speed Working Out Speed

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions x cm 4 cm

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria Time Working Out Time 1. To explain how to work out simple time calculations using the time formula. 1.Know the time formula. 2.Use the formula to work out simple time calculations.

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Time Working Out Time Imagine you flew 800 miles to Paris and the average speed of the plane was 200 miles/hr. To travel 200 miles takes 1 hour : To travel 800 miles takes : 800 ÷ 2 00 = 4 hours Can you guess what the formula is : in symbols

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 5 Ch10 (page 113) Time Working Out Time

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 1. To show the traingle method of remembering the distance, speed and time formulae. 1. Know and remember triangle method for distance, speed time problems. Time Distance Speed Mixed Problems 2. Apply triangle method to mixed problems.

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Time Distance Speed Mixed Problems D ST D=S x T Simple way to remember the 3 formulae !

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Time Distance Speed Mixed Problems D ST Example 1 : Daniel drove from his house to the Blackpool, a distance of 135 miles. It took him 2hrs 15mins. What was his average speed? Working Time MUST be in decimal form

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Time Distance Speed Mixed Problems D ST Example 2 : A racing car travelled at 50 km/hr. What is the distance covered in 6 hours ? Working

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Time Distance Speed Mixed Problems D ST Example 1 : How long did the bus journey take if it travelled a total distance of 60 km at and an average speed of 40 km/hr. Working

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 6 Ch10 (page 114) Time Distance Speed Mixed Problems

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 1.To interpret Time – Distance Graphs. 1. Understand the term interpret. Time Distance Graph 2.Understand that the speed can be calculated from the Time - Distance Graph. Interpreting Time – Distance Graphs

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Time Distance Graph Interpreting Time – Distance Graphs

S3 General 5-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 7 Ch10 (page 115) Time Distance Speed