Question

voice change of He does the sum​

Answer 1

$\green{ \mathfrak{ \underbrace{Answer}}}$

The sum is done by him.

Answer 2

The sum is done by him.

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Rules for conversion of Active Voice to Passive Voice -:

1. Identify the subject, the verb and the object.

2. Change the object into subject.

3. Put the suitable helping verb or auxiliary verb

4. Change the verb into past participle of the verb

5. Add the preposition "by"

6. Change the subject into object

Hope it helps! :)