1. Substitution in Formula Achbar the Egyptian is in the market selling his camels. Cairo Market - Prices Camel=20 Deben Sphinx=7 Deben Pyramid=52 Deben What will the value of the following be: Deben Remember, you must multiply before adding

2. Cairo Market - Prices Camel =20 Deben Sphinx =7 Deben Pyramid =52 Deben How many debens will Achbar have for: Deben

3. A Different Market Luxor Market - Prices Camel =15 Deben Sphinx =10 Deben Pyramid =45 Deben The prices are different in the market at Luxor What will the value of the following be: Deben

4. Are the pictures necessary? Luxor Market - Prices C=15 Deben S=10 Deben P=45 Deben What will the value of the following be: Deben We can write the problem easier without the pictures:

5. Exercise What will the value of the following be: 1.. 2.. 3.. 4.. 5.. Alexandria Market C=15 S=10 P=45

6. Subtracting in the Market Giza Market C=12 S=20 P=31 Remember that we can subtract as well as add What will the value of the following be:

7. Exercise Calculate the value of: 1.. 2.. 3.. 4.. 5.. C=12 S=20 P=31

8. Worksheet Answer the questions on the worksheet in your books. Remember to follow the same method as that given in the examples: Answers 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.

9. Worksheet There are more than one answer to some of the following questions: 17. 28. 29. 20. 21. A camel and10 deben is worth 22 deben, therefore: