Robert Recorde, who designed the equals sign, introduced plus and minus in 1557. Brahmagupta was an Indian mathematician who invented the multiplication sign around the 19th century. Johann Rahn first used the division sign in his book Teutshe algebra in 1659.
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Division. Division. Division. Division.
You use the numbers in the wheel and use multiplication. subtraction, addition, or division to equal the number that is outside of the wheel in the top right corner.
205
215
They have equal priority and are evaluated left to right. In fact, the US PEMDAS puts multiplication first whereas the UK BIDMAS puts division first. The only way to reconcile the two is equal priority.