Addition subtraction practice

You can customize mental arithmetic calculation practice brain Toreapuri.
Number of questions, time, calculation codes, let Kitaeyo the computing power by setting yourself a difficulty!
And analyze your computing power to record well as accuracy rate and answer time.

The records and analysis of a one-time basis, the number of correct answers from using the app, not the number of correct answers, accuracy rate, the answer mean time.

Brain Training, calculation drill, please use as a calculation practice.

[Settings]
Problem set number ... number of questions can be set with no upper limit
Can be set with no maximum number of items in the time limit set ... 1 second increments
Digit set of numbers (left) ... random one digit can be set in to 3-digit number
Sign setting ... random + (addition), chromatography (subtraction) · × (multiplication) can be set in-
Digit set of numbers (right) ... random one digit can be set in to 3-digit number