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- The
aim of using brackets is to join or to group everything that is between
them.
- Multiplication
signs have priority over addition and subtraction signs, that is,
when two numbers are joined by the multiplication sign they are inseparable.
But if they are linked by the addition or subtraction sign, they can be
separated.
- We must
know the properties of the operations so that we don't do anything wrong.
- To add up
or subtract two numbers they must be separated. We cannot add up two numbers if one of them is linked to another expression
by means of a multiplication sign.
- Combined
operations are solved in several steps. What is not solved in one step
must be copied as it was, without omitting it or changing its position.
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So, before starting to solve combined operations, we must evaluate the
expression and plan a strategy to implement: what we are going to
do before and after.
- As a general rule, it is best to solve what is inside the brackets first,
then do the multiplications and finally do the remaining additions.
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You
must type a
number
in the box below the window. This number must be
the result of a part of the expression.
You
must do it successively, step by step. In order to do this, you must delete
the previous number.
When you type the right number it will appear in the window. If
the typed number is not correct it will not appear.
It
is not about finding the final result
directly.
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When you
click on Init a new expression of combined operations will appear. Solve
some of them.
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