This web application allows you to teach kids first words, names, birthdays and simple Math.

It doesn't collect private information or use cookies, just the browser's local storage to save your preferences.

It is available on any device: tablet (ideal), phone, laptop or desktop. The recommended orientation for the handheld devices is landscape (horizontal). The only requirements are a web browser and an internet connection.

You can use Divisiki in a browser as is without any installation. However, you can install it on most devices via a browser. This will give you the native app experience and the ability to run offline when the internet connection is intermittent or unavailable. Please note that not all browsers are capable of that. Ideally, use Google Chrome or Microsoft Edge. You should find and click Add to Home screen menu item (or similar), then follow the prompts. On laptops and desktops, an icon with a monitor and an arrow might be displayed at the end of the address bar. If you hover it with the mouse cursor, a tooltip will pop: Install Divisiki. Click the icon and follow the prompts.

At start, tap or click the large play button in the center, and you'll see a random number. If it is divisible by the one(s) listed at the right bottom corner, click the green tick button. Otherwise, click the red cross button. If your mental calculation is right, you'll get another number, and the score at the right top corner will change. Otherwise, you'll see the large play button again, but the score will stay until you start another game. If the game is timed, every time you give an answer, the timer at the left bottom corner will be reset. The score at the top right corner is in the format of User: CurrentPoints / BestPoints.

• 2 - the lowest digit should be even (0, 2, 4, 6 or 8):
  20, 32, 154, 3276, 39158.
• 3 - the sum of all digits is divisible by the 3:
  12, 126, 459.
• 4 - the lowest two digits make the number that is divisible by 4:
  24, 356.
• 5 - the lowest digit is either 0 or 5:
  10, 135, 2480, 76905.
• 7 - multiply the lowest digit by 2 and subtract the result from the remaining digits; the final result should also be divisible by 7:
  14 ⇒ 4 * 2 - 1 ⇒ 7, 357 ⇒ 35 - 7 * 2 ⇒ 21.
• 8 - the lowest three digits form a number that is divisible by 8:
  128, 9008, 25064.
• 9 - the sum of all digits should be divisible by 9:
  18, 927, 4671.
• 10 - should end with 0:
  10, 120, 45700.
• 11 - the sum of the even digits should be equal to the sum of the odd digits or the difference between these sums should be divisible by 11:
  11 ⇒ 1 = 1, 121 ⇒ 2 = 2, 5335 ⇒ 8 = 8, 9020 ⇒ 11 - 0 ⇒ 11.
• 13 - multiply the lowest digit by 4 and add the result to the number formed by remaining digits; the final result should be divisible by 13:
  13 ⇒ 3 * 4 + 1 = 13, 52 ⇒ 2 * 4 + 5 = 13.
• 17 - multiply the lowest digit by 5 and subtract the result from the number formed by remaining digits; the final result should be divisible by 17:
  17 ⇒ 7 * 5 - 1 ⇒ 34 ⇒ 4 * 5 - 3 = 17, 153 ⇒ 3 * 5 - 15 = 0.
• 19 - multiply the lowest digit by 2 and add the result to the number formed by remaining digits; the final result should be divisible by 19:
  19 ⇒ 9 * 2 + 1 ⇒ 19, 114 ⇒ 4 * 2 + 11 = 19.
• 23 - multiply the lowest digit by 7 and add the result to the number formed by remaining digits; the final result should be divisible by 23:
  23 ⇒ 3 * 7 + 2 = 23, 115 ⇒ 5 * 7 + 11 = 46 = 23 * 2.

1. Every corner text should be clickable:
   • top right - change or rename a user (free text like: "Lily", "Johnny", "Mum", "Dad"), or reset stats
   • bottom left - change the time limit (no limit, 2m, 1m30s, 1m, 45s, 30s, 20s, 15s, 10s, 5s)
   • bottom right - change divisors:
     • 2 - check divisibility by 2
     • 6 - check divisibility by 2 and by 3
     • 2, 3 - check divisibility either by 2 or by 3
     • 6, 5 - check divisibility either by 2 and 3 or by 5