how make static cells in tableview controller objective c?

You are getting random questions because every time you scroll and a new cell becomes visible, you throw a dice and generate another question.

You should generate all the random questions beforehand, instead of in the cellForRowAtIndexPath method.

So you should generate an array of random numbers that refers to your question and answer array at viewDidLoad, same number as the cells in your table. Then in cellForRowAtIndexPath, access the number in that array and configure the cell to display that question.

This way you will have non-changing questions!

The code is a little bit messy, but essentially, we want to move the question generating logic into viewDidLoad, create an array to hold those things, then read it from the cellForRowAtIndexPath.

- (void)viewDidLoad {
  // GENERATING RANDOM QUESTIONS
  firstNumbers = [NSMutableArray array];
  lastNumbers = [NSMutableArray array];

  for (int i = 0; i < [tv numberOfRowsInSection:0]; i++) {
    int firstNumber, lastNumber;
    if ([mathCat isEqualToString:@"Easy"]) {
      firstNumber = [self getRandomNumberBetween:1 to:9];
      lastNumber = [self getRandomNumberBetween:1 to:9];
      // NSLog(@"firstNumber %d lastnumber %d",firstNumber,lastNumber);
    }
    else if ([mathCat isEqualToString:@"Medium"]){
      firstNumber = [self getRandomNumberBetween:10 to:99];
      lastNumber = [self getRandomNumberBetween:10 to:99];
      // NSLog(@"firstNumber %d lastnumber %d",firstNumber,lastNumber);
    }
    else if ([mathCat isEqualToString:@"Hard"]){
      firstNumber = [self getRandomNumberBetween:100 to:999];
      lastNumber = [self getRandomNumberBetween:100 to:999];
      // NSLog(@"firstNumber %d lastnumber %d",firstNumber,lastNumber);
    }

    [firstNumbers addObject:[NSNumber numberWithInt:firstNumber]];
    [lastNumbers addObject:[NSNumber numberWithInt:lastNumber]];
  }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  NSString *cellIdent = @"mycal";

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdent];
  yes=(UIButton *)[cell viewWithTag:1];
  no=(UIButton *)[cell viewWithTag:2];

  int firstNumber= [firstNumbers[indexPath.row] intValue];
  int lastNumber = [lastNumbers[indexPath.row] intValue];

  int calculation, ans=0;
  int todisplay= [self getRandomNumberBetween:0 to:1];
  NSLog(@"to display:::%d",todisplay);
  if(finalanswers==nil) {
    finalanswers=[[NSMutableArray alloc]init];
  }

  [finalanswers addObject:[NSNumber numberWithInt:todisplay]];
  NSLog(@"finalanswers::::%@",finalanswers);
  calculation=[self getRandomNumberBetween:0 to:3];
  NSLog(@"cat value %@",mathCat);


  // NSLog(@"calc value is -->  %@",[mathcal objectAtIndex:calculation]);

  // REMOVED GENERATION TO VIEW DID LOAD

  //cell.textLabel.text = [NSString stringWithFormat: @"%d+%d=%d",firstNumber,lastNumber,todisplay];
  if (todisplay==0) {
    if (calculation==0) {
      ans=firstNumber+lastNumber;
      answer=[NSString stringWithFormat:@"%d + %d=%d",firstNumber,lastNumber,ans];

      cell.textLabel.text=answer;
      return cell;
    }
    else if (calculation==1){
      ans=firstNumber-lastNumber;
      answer=[NSString stringWithFormat:@"%d - %d=%d",firstNumber,lastNumber,ans];

      cell.textLabel.text=answer;
      return cell;
    }
    else if (calculation==2){
      ans=firstNumber*lastNumber;
      answer=[NSString stringWithFormat:@"%d * %d=%d",firstNumber,lastNumber,ans];

      cell.textLabel.text=answer;
      return cell;
    }
    else if (calculation==3){
      ans=firstNumber/lastNumber;
      answer=[NSString stringWithFormat:@"%d / %d=%d",firstNumber,lastNumber,ans];

      cell.textLabel.text=answer;
      return cell;
    }

  }
  else if (todisplay==1){
    int ans=[self getRandomNumberBetween:10 to:50];
    answer=[NSString stringWithFormat:@"%d+%d=%d",firstNumber,lastNumber,ans];
    cell.textLabel.text=answer;
    return cell;
  }

  return cell;
}

-(int)getRandomNumberBetween:(int)from to:(int)to {
  return (int)from + arc4random() % (to-from+1);
}

Note, I declared firstNumbers, lastNumbers as NSMutableArray in the header, as well as assumed you have a reference to your tableView, named tv. Finally, I assumed you only have a single section in your table. Hope this helps!