6 + 9 x 0 – 3
… what part should you calculate first?
Start at the left and go to the right? Or go from right to left?
BODMAS is an acronym or mnemonic used to help learners remember the correct order to complete mathematical calculations in the ‘order of operations’. The order of operations (or operator precedence) is a collection of rules that reflect conventions about which procedures to perform first in order to evaluate a given mathematical expression.
Each letter stands for a mathematical operation.
|Orders/Others||Orders are square roots or indices (sometimes called powers or exponents, square numbers and cube numbers). For example, 2³: the little 3 means that you multiply the number 3 times, 2 x 2 x 2 = 8. A square root is the inverse of a square number, so √25, the square root of 25, is 5 because 5 x 5 or 5² equals 25.|
|Division: ÷||Splitting into equal groups or parts|
|Multiplication: x||Groups of|
|Addition: +||The total of numbers together|
|Subtraction: –||To take away numbers from other numbers|
Anything in Brackets should be completed first, then the orders, followed by any division or multiplication and finally addition or subtraction.
Division and Multiplication have been grouped together as they are of the same level; this means that if you have a calculation involving division and multiplication then you complete them as they appear from left to right. This is the same for addition and subtraction; they are completed as they appear from left to right.
So here is the answer to the above challenge:
6 + 9 x 0 – 3
= 6 + (9 x 0) – 3
= 6 + 0 – 3
The answer is thus B.