YEAR 4 MEASUREMENT Lesson 27 Measurement Lesson 11
- Slides: 6
YEAR 4 MEASUREMENT Lesson 27 Measurement Lesson #11 Ordering measurements in metres and kilometres
To order lengths we need to compare several different lengths. If the lengths are in the same unit of measure, we can just compare which number is larger by first looking at digit largest in value (the digit furthest left), and then working our way across to the right. For example: 0. 18 m and 0. 81 m is larger because starting from the largest value, they both have zero in the ones column, but then 0. 81 m has 8 tenths whereas 0. 18 m has 1 tenth so 0. 81 m is larger. So if I wanted to order: 8 m, 0. 80 m, 0. 18 m, 0. 818 m and 80 m from smallest to largest it would be: 0. 18 m, 0. 80 m, 0. 818 m, 8 m and 80 m
If we are looking at two different units of measure (e. g. metres and kilometres), then we must first convert some of the lengths so that they are all in the same unit of measure. E. g. 6 km, 0. 006 km, 400 m, 3200 m, 4 km As there are less lengths in metres, it may be easiest to convert the metres into kilometres first. Th H T O . 4 0 0 0 m . t 4 h th km Th H T O . 3 2 0 0 3 m . t h 2 km th Now that all of the lengths are in the same unit of measure, I can order them from smallest to largest: 0. 006 km, 0. 4 km, 3. 2 km, 4 km, 6 km So looking at the original numbers: 0. 006 km, 400 m, 3200 m, 4 km, 6 km If you are confident, you may be able to tell without converting which length is greater. E. g. 752 m or 1 km. We should know there are 1000 m in every 1 km, so 752 m must be smaller than 1 km. This is something you could practise as you get more confident.
Your Turn. Have a go at ordering these lengths from smallest to largest: 7. 1 km, 720 m, 7400 m, 7 km, 7. 6 km Th H T O . t h th Th H T O . . . t h th
Your Turn. Have a go at ordering these lengths from smallest to largest: 32 m, 2300 km, 3200 m, 3. 1 km, 320 km Th H T O . t h th Th H T O . . . t h th
Your Turn. Have a go at ordering these lengths from smallest to largest: 0. 95 km, 920 m, 9. 2 km, 95 m, 9250 m Th H T O . t h th Th H T O . . . t This time, you might want to try converting from km to m. h th
