+
Addition Speed Test
How fast can you add? Twenty addition problems, a two-minute clock and up to four other racers. Every correct answer moves your car forward. It is the quickest way to sharpen mental addition and see where you rank.
Free, no sign-up needed. 20 problems, 2 minutes.
What the problems look like
7 + 9
14 + 18
19 + 6
12 + 15
Tricks to get faster
- →Make ten first: 8 + 7 is 8 + 2 + 5, which is 15.
- →Add the tens, then the ones: 14 + 18 is 20 + 12, which is 32.
- →Use doubles: 16 + 17 is double 16 plus 1, which is 33.
How the race works
- 1. Join a raceYou are matched with up to four other racers. If nobody is online, computer racers matched to your level fill in.
- 2. Type and press EnterEvery correct answer moves your car forward. A wrong answer keeps you on the same problem.
- 3. Climb the ranksYour speed (problems per minute) and finishing place update your ELO rating, from Beginner to Grandmaster.
Questions
What is a good addition speed?
Most players start between 15 and 25 problems per minute (PPM). Above 30 PPM is fast, and the top of the leaderboard regularly goes past 50.
Do I need an account?
No. You can race as a guest straight away. Create a free account to keep your rating, unlock cars and appear on the leaderboard.
Is it good for kids?
Yes. The numbers stay between 1 and 20, so the challenge comes from speed rather than difficulty, which makes it a popular classroom warm-up.