Question

529+ _____
= 398 +529.​

Answer 1

Here we have to find the missing number.

Now, one of the properties of addition is the commutative property.

According to this property whatever be the order of the numbers the result will always be the same

For example: If we write 4+8 or 8+4, the final answer in both the cases will be 12

Similarly if we write 529+398  or 398 +529., the answer will be 927

So 529+ 398= 398 +529.​

Answer 2

Given data,

$529+$____$= 398+529$

Now we have to find out the value which comes in the given blank.

As we know by the property of commutative property of addition

Commutative property of addition : If the order of the attendants changes then their addition does not changes.

Formula:

$a+b=b+a$

Here we can write the values by comparing given question and formula.

We get,

$a=529$ and $b=398$

Therefore, the blank is filled with the number $398$.