1. Whiteboardmaths.com © 2007 All rights reserved 5 7 2 1

2. 1 kg 100 200 300 400 500 600 700 800 900 0 grams 1 kilogram = 1000 grams 1 kg = 1000 g Metric and Imperial Equivalents scales

3. 2.2 lbs 100 200 300 400 500 600 700 800 900 0 grams 1 kilogram = 1000 grams 1 kg = 1000 g 1 kg  2.2 lbs Metric and Imperial Equivalents

4. 1 kg 100 200 300 400 500 600 700 800 900 0 grams 100 200 300 400 500 600 700 800 900 0 grams 2.2 lbs  To make mental calculations between kg and lbs easier you could use 1 kg  2 lbs but you should be aware that your answers will be less accurate by about 10%.

5. Q kg to lbs Metric and Imperial Equivalents (Mass) ½ kg 10 kg Find the mass in pounds. ½ x 2 = 1 lb (rough) 10 x 2.2 = 22 lbs (accurate) ½ x 2.2 = 1.1 lbs (accurate) 10 x 2 = 20 lbs (rough)

6. Metric and Imperial Equivalents (Mass) 0.7 kg 3.8 kg Find the mass in pounds. 0.7 x 2 = 1.4 lbs (rough) 3.8 x 2.2 = 8.36 lbs (accurate) 0.7 x 2.2 = 1.54 lbs (accurate) 3.8 x 2 = 7.6 lbs (rough)

7. Metric and Imperial Equivalents (Mass) 85 kg Find the mass in pounds. 85 x 2 = 170 lbs (rough) 56 x 2.2 = 123.2 lbs (accurate) 85 x 2.2 = 187 lbs (accurate) 56 x 2 = 112 lbs (rough) 56 kg

8. Metric and Imperial Equivalents (Mass) Questionkglbs (rough)lbs (accurate) 14 26 38.5 412 50.2 66.7 754 875.6 9350 10¾ Complete the table below.

9. Metric and Imperial Equivalents (Mass) Questionkglbs (rough)lbs (accurate) 1488.8 261213.2 38.51718.7 4122426.4 50.20.40.44 66.713.414.74 754108118.8 875.6151.2166.32 9350700770 10¾1½1.65 Complete the table below.

10. Metric and Imperial Equivalents (Mass) 2.2 lbs  1 kg So 1 lb  1 kg  2.2 1 lb  0.45 kg. To make mental calculations between lbs and kg easier you could use 1 lb  ½ kg but again you should be aware that your answers will be less accurate by about 10%.

11. lbs to kg Metric and Imperial Equivalents (Mass) 2 lbs 10 lbs Find the mass in kg. 10 x 0.45 = 4.5 kg (accurate) 2 x 0.45 = 0.9 kg (accurate) 2 x ½ = 1 kg (rough) 10 x ½ = 5 kg (rough)

12. Q. lbs to kg Metric and Imperial Equivalents (Mass) 0.8 lbs 5.6 lbs Find the mass in kg. 0.8 x ½ = 0.4 kg (rough) 5.6 x 0.45 = 2.52 kg (accurate) 0.8 x 0.45 = 0.36 kg (accurate) 5.6 x ½ = 2.8 kg (rough)

13. Metric and Imperial Equivalents (Mass) 230 lbs Find the mass in kg. 230 x ½ = 115 kg (rough) 140 x 0.45 = 63 kg (accurate) 230 x 0.45 = 103.5 kg (accurate) 140 x ½ = 70 kg (rough) 140 lbs

14. Metric and Imperial Equivalents (Mass) Questionlbskg (rough)kg (accurate) 14 26 38.4 412 50.2 66.8 754 864.6 9450 10½ Complete the table below.

15. Metric and Imperial Equivalents (Mass) Questionlbskg (rough)kg (accurate) 1421.8 2632.7 38.44.23.78 41265.4 50.20.10.09 66.83.43.06 7542724.3 864.632.329.07 9450225202.5 10½¼0.225 Complete the table below.

16. oz to g Metric and Imperial Equivalents (Mass) Remember: 1 lb = 16 ounces (oz) and 1 kg = 1000 g We can use these relationships to find out how many ounces there are in 1 gram. 1 lb 16 oz 1 kg 1000 g 2.2 x 16 = 35.2oz  35.2 oz  1000 g So 1 oz  1000g  35.2 1 oz  28.4 g (1 dp) When converting between ounces and grams a rough approximation is: 1 ounce = 30 g

17. Q. oz to g An old recipe for savoury oat cakes includes the following ingredients. Re-write the ingredients in ounces. 1 oz margarine 2 oz grated cheese 2½ oz self-raising flower 5 oz oatmeal Metric and Imperial Equivalents (Mass) 1 oz = 28.4 g 2 oz = 2 x 28.4 = 56.8 g 2½ oz = 2½ x 28.4 = 71 g 5 oz = 5 x 28.4 = 142 g Good approximations 1 oz = 30 g 2 oz = 2 x 30 = 60 g 2½ oz = 2½ x 30 = 75 g 5 oz = 5 x 30 = 150 g Rough approximations Good approximation 1 oz = 28.4 g Rough approximation 1 oz = 30 g

18. Metric and Imperial Equivalents (Mass) Find the mass in grams. 5.4 oz 13.6 oz 5.4 x 30 =162 g (rough) 13.6 x 28.4 = 386.24 g (good) 5.4 x 28.4 = 153.36 g (good) 13.6 x 30 = 408 g (rough)

19. Metric and Imperial Equivalents (Mass) Find the mass in grams. ½ lb 2 lbs 8 x 30 =240 g (rough) 32 x 28.4 = 908.8 g (good) 8 x 28.4 = 227.2 g (good) 32 x 30 = 960 g (rough)

20. Metric and Imperial Equivalents (Mass) Questionozg (rough)g (good) 11 2½ 32¼ 46 59 610 712.6 814½ 915 1016 Complete the table below.

21. Metric and Imperial Equivalents (Mass) Questionozg (rough)g (good) 113028.4 2½1514.2 32¼67.563.9 46180170.4 59270255.6 610300284 712.6378357.84 814½435411.8 915450426 1016480454.4 Complete the table below.

22. g to oz Metric and Imperial Equivalents (Mass) 35.2 oz  1000 g So 1 oz  1000g  35.2 1 oz  28.4 g (1 dp) To convert ounces to grams we have multiplied by 30 or 28.4. 5 oz 142 g 5 x 30 = 150 g or 5 x 28.4 = 142 g To convert grams to ounces we simply divide by 30 or 28.4. 142  30 = 4.7 oz or 142  28.4 = 5 oz

23. Q. g to oz An old recipe for savoury oat cakes includes the following ingredients. Re-write the ingredients in ounces. Give answers to the nearest ½ ounce. 60 g margarine 100 g grated cheese 150 g self-raising flower 170 oz oatmeal Metric and Imperial Equivalents (Mass) 60 g = 60  28.4 = 2 oz 100 g = 100  28.4 = 3½ oz 150 g = 150  28.4 = 5 oz 170 g = 170  28.4 = 6 oz Good approximations Good approximation 1 oz = 28.4 g Rough approximation 1 oz = 30 g Rough approximations 60 g = 60  30 = 2 oz 100 g = 100  30 = 3 oz 150 g = 150  30 = 5 oz 170 g = 170  30 = 5½ oz

24. Metric and Imperial Equivalents (Mass) Find the mass in ounces (nearest ½ oz) 180 g 500 g 180  30 = 6 oz (rough) 500  28.4 = 17½ oz (good) 180  28.4 = 6½ oz (good) 500  30 = 16½ oz (rough)

25. Metric and Imperial Equivalents (Mass) 300 g 950 g 300  30 = 10 oz (rough) 950  28.4 = 33½ oz (good) 300  28.4 = 10½ oz (good) 950  30 = 31½ oz (rough) Find the mass in ounces (nearest ½ oz)

26. Metric and Imperial Equivalents (Mass) Questiongramsoz (rough)oz (good) 130 215 367.5 4180 5270 6300 7378 8435 9450 10480 Complete the table below (nearest ½ oz)

27. Metric and Imperial Equivalents (Mass) Questiongramsoz (rough)oz (good) 13011 215½½ 367.52½ 418066½ 527099½ 63001010½ 737812½13½ 843514½15½ 94501516 104801617 Complete the table below (nearest ½ oz)

28. Worksheets Questionkglbs (rough)lbs (accurate) 14 26 38.5 412 50.2 66.7 754 875.6 9350 10¾ Questionlbskg (rough)kg (accurate) 14 26 38.4 412 50.2 66.8 754 864.6 9450 10½ Worksheet 1

29. Questionozg (rough)g (good) 11 2½ 32¼ 46 59 610 712.6 814 ½ 915 1016 Questiongramsoz (rough)oz (good) 130 215 367.5 4180 5270 6300 7378 8435 9450 10480 Worksheet 2