Grade 7 Questions on variables worksheet - complete this
Grade 8 complete the first two pages of the investigation sheet, including the section on variables and safety.
Grade 9 Find out how much your family pays per unit of electricity (kWh) at home. If it is a spot price contract, use the price now to calculate how much it costs each time to use your sauna. If you do not know the power of the sauna, assume it is 3 kW. If you do not use a sauna, assume 3 kW and it takes 2 hours! Show all your working, including the estimate of the time spent heating and using the sauna.