I have often been told that I exceed at math, especially when it comes to mental calculations. I was excited, then, to be able to approach my mathematical Achilles’ heel: subtraction. For whatever reason, addition has always made more sense. Although in all fairness, I don’t think many would say that they prefer subtraction, so much that they add by subtracting a negative value.
It is with this background that I approached Mental Calculation2 Minus (free), the latest in a series of math tools created by tatsuya itoh.
The app is relatively simple in layout and design, simply choose the number of questions you want to answer and then how many digits in the minuend and the subtrahend (I had to Google that, I do numbers not words!). This gives a range of 20-100 questions and 1-1 to 99-99.
The gameplay involves a rapid-fire style questioning system, but with a catch: the next equation is somewhat visible behind the current. This information is not much help when you are trying to figure out 75-38, but it can certainly help to increase speed when solving 7-5.
The rounds are timed, and lend themselves well to online leaderboards. Fortunately Itoh has one for each combination and they are already hotly contested. I am proud of my current stance of 15.45 seconds for 20 questions, putting me at 9 of 222 players.
As this is a free app, it is not surprising that there is minor advertising. However, this is limited to a small bar on the bottom of the home screen which links to the developer’s page in the App store.
For anyone looking to brush up on there subtractions, or people looking for something in the vain of the math portion of Brain Age on DS, Mental Calculation2 Minus (free) is an easy recommendation.