Update score animation

I want to update my score with animation like 2048. In this link (2048) you can play and see +4, +8 animated text while updating score.

there you go - I made a complete scene using a different approach than your

Draw the “+Number” text over your score and move it up each frame. Reduce the alpha value each frame as well and it will have a fading effect just like that. Remove or reset it once it becomes invisible.

I made it. Codes are belowed.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class AnimateText : MonoBehaviour
{

		public Text txt;
		public float moveSpeed = 100.0f;
		public float alphaValue = 1.0f;


		// Use this for initialization
		void Start ()
		{

		}
	
		// Update is called once per frame
		void Update ()
		{

				if (alphaValue <= 0.0f) {
						txt.transform.Translate (new Vector2 (0, 0));
						txt.enabled = false;
						
				} else {
						txt.transform.Translate (new Vector2 (0, moveSpeed) * Time.deltaTime);
			
						alphaValue -= Time.deltaTime;
			
						txt.color = new Color (1.0f, 1.0f, 1.0f, alphaValue);	
				}
	
		}

		public void Exit ()
		{
				Application.Quit ();
		}

		public void Restart(){
		Application.LoadLevel (0);
	}
}