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Hi @joetomlee! The BA II Plus and HP 12C isn’t quite like the scientific calculators you may have used in the past – they don’t really take a long arithmetic string that easily. To specifically address the arithmetic string you posted, I’d simply use a combination of the calculator and mentally calculating some bits:
First operation: 12 x .6
Add in 4 (8 x .5): + 4
Divide the whole thing by 2: ÷ 2 =
Hope that helps!