Multiplication binds tighter than addition

2 + 3 × 4 is 14, not 20. Multiplication and division are resolved before addition

Why it works

Precedence is a convention about what an expression MEANS, not an instruction about the

Do it exactly

Estimate with the rule, then check it against the calculator that models it properly.

Open Scientific Calculator →

More in Mathematics

• SOH-CAH-TOA is one triangle, memorised three waysSine, cosine and tangent are just three different ratios of the same right triangle’s sides — kn…
• Area scales with the square, volume with the cubeDouble every dimension of a shape and its area quadruples while its volume grows eightfold — the…
• A column of the periodic table is a predictionElements in the same group share the number of electrons in their outermost shell, so they react…
• Atoms get smaller as you add electronsMoving left to right along a period, atoms shrink even though electrons are being added — lithiu…

Does a calculator do the sum in the order I typed it?

2 + 3 × 4 is 14, not 20. Multiplication and division are resolved before addition Precedence is a convention about what an expression MEANS, not an instruction about the .

Browse all 162 rules of thumb →