{"text_format":"1","workbook":"xlsx","n_sheets":4,"sheets":["Instructions","French Class","Helicopter","Chess set"],"not_rendered":{"charts":0,"images":4,"macros":1,"external_links":0,"defined_names":20,"comments":0,"pivot_tables":0},"unopened":[],"bounds":{"document_bytes":16777216,"sheet_cells":100000,"rows_first":2000,"rows_last":500,"rows_between":2000,"halvings":0,"cell_chars":16384,"cell_head_chars":4096},"cells_cut":0,"cells_raw":0,"read":"whole","date_system":"1900"}

{"sheet":"Instructions","index":0,"n_rows":18,"n_cols":2,"rows_kept":18,"cut":false,"hidden":false,"merged":[]}
[]
[]
[null,"What would happen if I change (choose one of the numbers)"]
[null,"Can I increase/decrease a value and make the total smaller/bigger?"]
[null,"What if I wanted the total cost/time taken to be…"]
[]
[null,"Hide each number in turn"]
[null,"If you didn't know this number, how could it be found from the others?"]
[]
[null,"Hide two numbers"]
[null,"What could they be? Construct a table of possible values"]
[null,"Repeat with another pair of numbers"]
[]
[null,"Hide all the numbers"]
[null,"Construct a general formula for the relationship between them"]
[null,"Try to write your formula in different ways p=, z= etc"]
[]
[null,"Check that the formula works using spreadsheets"]

{"sheet":"French Class","index":1,"n_rows":14,"n_cols":10,"rows_kept":14,"cut":false,"hidden":false,"merged":[]}
[]
[null,null,"The French Class"]
[]
[]
[null,null,null,null,null,null,null,"h"]
[null,null,"It costs the teacher",null,null,null,"£",300,"to hire the hall for the whole course"]
[null,null,null,null,null,null,null,"n"]
[null,null,"The class contains",null,null,null,null,12,"students"]
[null,null,null,null,null,null,null,"f"]
[null,null,"Each student pays the teacher",null,null,null,"£",100,"for the course"]
[]
[]
[null,null,null,null,null,null,null,null,null,"p"]
[null,null,"The amount of profit the teacher makes is",null,null,null,null,null,"£",{"$f":"n*f-h","v":900}]

{"sheet":"Helicopter","index":2,"n_rows":14,"n_cols":11,"rows_kept":14,"cut":false,"hidden":false,"merged":[]}
[]
[]
[null,null,"Helicopter Rescue"]
[]
[null,null,null,null,null,null,null,"w"]
[null,null,"A rescue helicopter takes",null,null,null,null,7,"minutes to warm up."]
[null,null,null,null,null,null,null,"s"]
[null,null,"It can then fly at",null,null,null,null,5,"km per minute."]
[null,null,null,null,null,null,null,"d"]
[null,null,"It travels to an accident",null,null,null,null,20,"km away."]
[]
[null,null,"The time taken from receiving the alarm to"]
[null,null,null,null,null,null,null,null,null,"t"]
[null,null,"reaching the scene of the accident is",null,null,null,null,null,null,{"$f":"w+(d/s)","v":11},"minutes."]

{"sheet":"Chess set","index":3,"n_rows":13,"n_cols":11,"rows_kept":13,"cut":false,"hidden":false,"merged":[]}
[]
[]
[null,null,"Making chess sets"]
[null,null,"I want to make and sell chess sets"]
[null,null,null,null,null,"w"]
[null,null,"It costs me",null,"£",10,"to buy molds to make the pieces"]
[null,null,null,null,null,null,null,null,null,"x"]
[null,null,"Resin and paint to make the pieces costs",null,null,null,null,null,"£",3,"per chess set"]
[null,null,null,"y",null,null,null,"z"]
[null,null,"I sell",30,"chess sets for",null,"£",10,"each."]
[]
[null,null,null,null,"b"]
[null,null,"I make","£",{"$f":"y*(z-x)-w","v":200},"profit"]