Calculators in schools Important to spend time building non-calculator skills. Should schools have a dedicated non-calculator exam ? They aren’t going away => we need an intelligent way of dealing with them. Pupils will have different makes of calculator => we, as teachers should be able to master most popular types of calculator. School Policy on calculators: Each school should decide how to integrate the use of calculators into their school. Calculators in first year ? No calculators until Christmas of first year ? One particular type of calculator recommended by a school ? Golden rule: Don’t do anything on the calculator that you haven’t already indicated on paper

Natural Display Calculator

Using the fraction capability Example : Evaluate ¾ + ½ Right arrow arrow Down arrow Down arrow Example : Evaluate 2¾ + ¼ Right arrow arrow Right arrow arrow Down arrow Down arrow

Using the memory capability Example : Store 6.8 in memory location X Example : Evaluate 0.2 + X using the memory function Task : 1) Store 3.8 in memory location Y 2) Use the memory function to evaluate X + Y 3) Change the numbers in memory X to 4 and memory Y to 5 and then evaluate X + Y, using the memory function 4) Evaluate 5X2 – 7x -1 5) Evaluate 4X3 +2X2 –x +4

Clearing all settings on the calculator Yes Re-set Recommended decimal setting Norm

Graph the function y=x2+3x-4 in the domain -5x2 Step 1: Go into table mode in calculator Step 2: Set up function

Graph the function y=x2+3x-4 in the domain -5x2 Step 3: To set up lowest x co-ordinate Step 4: To set up highest x co-ordinate Step 5: To see table Handout

TASKS Try the following functions using the table mode y = 3x -2 in the domain -3  x  3 Graph the function f: x 7-5x-2x2 in the domain -4  x  2 Graph the function TASKS: Store 5 in memory and then use the memory recall function to evaluate 2x3-6x2+4x-9 when x is 5 ( Answer is 111 ) Evaluate (43)2 and also evaluate 729 1/6 ( Answers are 4096 and 3 ) 6.4 x 107 – 1.2 x 105 (Answer is 63 880 000) Demonstrate the following limit