Compound measures MATHSWATCH CLIP 142 143 GRADE 4

Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 L. O. To be able to § Solve problems involving speed, distance and time Key Words compound, speed, distance, time, per, units

Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 SPEED, DISTANCE, TIME

Difficulty * Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Speed is a compound measure because it tells us about the relationship between how far something is travelling and the time it is taking Discussion What unit of measure would you use to describe how fast the following things are travelling… a) b) c) d) A car travelling on the motorway A person running in a race A snail moving across the ground A meteor travelling through space

Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Speed, Distance and Time § Use the triangle by covering up the thing you want to work out D S × T § Remember the line means divide § Check that all the units match before you calculate § Think of your own way to remember the order of letters in the triangle (SDT)

Difficulty * Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 The unit for distance is miles The unit for time is hours So what is the unit for speed?

Difficulty * Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 The unit for distance is miles The unit for time is hours So what is the unit for speed? mph miles per hour

Difficulty * Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 The unit for Distance is kilometres The unit for Time is hours So what is the unit for speed?

Difficulty * Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 The unit for Distance is kilometres The unit for Time is hours So what is the unit for speed? km/h kilometres per hour

Difficulty * Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 The unit for Distance is metres The unit for Time is seconds So what is the unit for speed? 345018

Difficulty * Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 The unit for Distance is metres The unit for Time is seconds So what is the unit for speed? 345018 m/s metres per second

Difficulty ** Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Task A car travels 126 miles in 3 hours. Find its average speed.

Difficulty ** Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Task A car travels 126 miles in 3 hours. Find its average speed. d s= t 126 s= 3 = 42 mph

Difficulty ** Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Task A car travels 40 miles in 45 minutes. Find its average speed.

Compound measures Difficulty ** MATHSWATCH CLIP 142, 143 GRADE 4 Task A car travels 40 miles in 45 minutes. Find its average speed. d s= t s= 40 ¾ 40 or s = = 53. 3 mph (1 dp) 0. 75

Difficulty ** Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Task A train completes a 520 km journey at an average speed of 160 km/hr. Find the time taken for the journey.

Compound measures Difficulty ** MATHSWATCH CLIP 142, 143 GRADE 4 Task A train completes a 520 km journey at an average speed of 160 km/hr. Find the time taken for the journey. d t= s t= 520 160 = 3. 25 hours (3 hours 15 minutes)

Difficulty ** Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Task A train completes a 442 km journey at an average speed of 170 km/hr. Find the time taken for the journey. Give your answer in hours and minutes.

Compound measures Difficulty ** MATHSWATCH CLIP 142, 143 GRADE 4 Task A train completes a 442 km journey at an average speed of 170 km/hr. Find the time taken for the journey. Give your answer in hours and minutes. d t= s t= 442 170 = 2. 6 = 2 hrs 36 mins Remember: 0. 6 hours = 6/10 of 60 minutes

Difficulty ** Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Task Sally walked for 3 hours at an average speed of 5. 25 mph. Find the distance she walked, in miles.

Difficulty ** Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 Task Sally walked for 3 hours at an average speed of 5. 25 mph. Find the distance she walked, in miles. d = st d = 3 x 5. 25 = 15. 75 miles

Difficulty * 1. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 10 mph for 1 hour, how far do you travel? 10 miles 5 miles 10 kilometres

Difficulty * 1. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 10 mph for 1 hour, how far do you travel? 10 miles

Difficulty * 2. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 40 mph for ½ hour, how far do you travel? 40 miles 80 miles 20 miles

Difficulty * 2. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 40 mph for ½ hour, how far do you travel? 20 miles

Difficulty ** 3. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel 50 km in ½ an hour, what speed are you travelling at? 50 km/h 25 km/h 100 km/h

Difficulty ** 3. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel 50 km in ½ an hour, what speed are you travelling at? 100 km/h

Difficulty ** 4. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel 60 km in 2 hours, what speed are you travelling at? 30 km/h 60 km/h 120 km/h

Difficulty ** 4. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel 60 km in 2 hours, what speed are you travelling at? 30 km/h

Difficulty ** 5. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 How would you write 1 hour 30 minutes in hours? 1. 3 hours 1. 5 hours 130 hours

Difficulty ** 5. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 How would you write 1 hour 30 minutes in hours? 1. 5 hours

Difficulty ** 6. in Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 How would you write 3 hours 45 minutes hours? 3. 45 hours 3. 25 hours 3. 75 hours

Difficulty ** 6. in Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 How would you write 3 hours 45 minutes hours? 3. 75 hours

Difficulty *** 7. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 20 km/h, how long does it take to go 40 km? 1 ½ hours 2 hours 4 hours

Difficulty *** 7. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 20 km/h, how long does it take to go 40 km? 2 hours

Difficulty *** 8. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 40 km/h, how long does it take to go 60 km? 1½ hours 2 hours 3 hours

Difficulty *** 8. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 40 km/h, how long does it take to go 60 km? 1½ hours

Difficulty *** 9. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel 30 km in 1 and a ½ hours, what speed are you travelling at? 20 km/h 30 km/h 10 km/h

Difficulty *** 9. Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel 30 km in 1 and a ½ hours, what speed are you travelling at? 20 km/h

Difficulty *** 10. far Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 40 km/h for ¾ hour, how do you travel? 20 km 30 km 10 km

Difficulty *** 10. far Compound measures MATHSWATCH CLIP 142, 143 GRADE 4 If you travel at 40 km/h for ¾ hour, how do you travel? 30 km

Difficulty *** Fill in the gaps Compound measures MATHSWATCH CLIP 142, 143 GRADE 4

Difficulty *** Solutions Compound measures MATHSWATCH CLIP 142, 143 GRADE 4