# The order of actions.

Maths for Grade 4 - Teaching the order in which we perform math activities and some consolidation exercises.

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## Calculate and wouuld accordance with the order of tasks

- first we perform tasks in parentheses (of course, according to the sequence of actions)

- after calculating what we have in parentheses, we go to power and square root

- we do multiplication and division

- finally we do addition and subtraction

When we have different actions in action, then we first perform powers (or roots), then multiplication and division with the principle "from left to right" and finally addition and subtraction also using the principle "from left to right":

e.g. 30 + 4 2 : 2 = 30 + 16: 2 = 30 + 8 = 38

e.g. 45 - 3 0 * 10 = 45 - 1 * 10 = 45 - 10 = 35

## (30 + 6): 6 + 10 =

When there is only addition and subtraction in action, then we calculate everything from the rule "from left to right":

e.g. 20 + 7 - 3 = 27 - 3 = 24

If there are, among others, parentheses in the action, then, according to the rule, first we calculate what is in the parentheses, then we go to powers (roots), multiplication and division, and finally addition and subtraction:

e.g. 4 * (10 - 2): 2 2 = 4 * 8: 2 2 = 4 * 8: 4 = 32: 4 = 8

When there is only multiplication and division in the operation, we also perform a left-to-right calculation:

e.g. 30: 6 * 6 = 5 * 6 = 30

## 2 * (40: 5) - 8 =

When there is a power (or a square root) in an action, then we start the calculations from them:

e.g. 81: 3 2 = 81: 9 = 9

e.g. 2 * 3 2 = 2 * 9 = 18