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Substitution on the farm.

Substitution on the farm. Mr Johnson. Farm song. http:// www.youtube.com/watch?v=w6ySjiDl6-4. Warm Up…. x= 1, y = 2.5, z = 0.5, r = 12 and s = 13.2. Y ou can only use each number once. You can add, subtract, times and divide . Write a formula that makes the largest number you can .

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Substitution on the farm.

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  1. Substitution on the farm. Mr Johnson

  2. Farm song http://www.youtube.com/watch?v=w6ySjiDl6-4

  3. Warm Up… x= 1, y = 2.5, z = 0.5, r = 12 and s = 13.2 You can only use each number once. You can add, subtract, times and divide. Write a formula that makes the largest number you can. Can write a formula that equals or is close to 100? Level 4 – use symbols to represent unknowns.

  4. Learning Objectives. Level 4 - use symbols to represent unknowns. Level 5 – in context use formulae that are expressed in symbols. Level 7 – generate formulae in context. Keywords – formula, variable, expression, equation

  5. Ploughing and Sowing. Farmer Fred wants to plough and sow his field? How much is it going to cost him?

  6. So we need to know… • Distance covered by the plough. • Time taken to plough. • Labour cost. • Fuel cost.

  7. 2 4 3 1

  8. 2 4 1 3

  9. What have I got to do? Step 1: Use the formulae to find the cost of ploughing the field. Step 2: Write in words what these formulae actually mean. Step 3: Ask for the extension data sheet and use it to find the cost of sowing the field. Step 4: Write your own formulae for finding the cost of sowing the seed.

  10. EXTENSION. Is there anything else you could consider in calculating the cost of ploughing and sowing the field? Can you make our calculations more accurate?

  11. Plenary. Come and write a formula that you made this lesson on the board.

  12. Learning Outcomes. Level 4 - use symbols to represent unknowns and variables. Level 5 – in context use formulae that are expressed in symbols. Level 7 – generate formulae in context.

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