Make sure you understand the order of operations in any calculation.
Do any calculations in brackets first.
Next calculate any exponents (powers)
Then do any multiplication or division (these have equal precedence)
Finally do any addition or subtraction (these two operations have equal precedence)
Remember you can check any calculation on WolframAlpha – make sure you enter it correctly.
4 + 5 x 6 = 4 + 30 = 34
2x2 when x = 3 is 2×32 = 2×9 = 18
See this site for step by step explanations.
Enter your calculation on the top line using * for multiplication.