Calculation Training

MostlyClear. J

In-app purchases

About this app

Train the mental math you need for aptitude tests, case interviews, and everyday number sense.

• Arithmetic training: addition, subtraction, multiplication, and division, from 1-digit up to 5-digit numbers
• Comparison training: quickly judge which is bigger — fractions, products, sums, growth and decrease rates, and multiples
• Past exam training: comparison items from real Korean data interpretation exams
• Statistics: accuracy and solving-time trends, plus detailed stats by question type
• Wrong answer notes for focused review

Supports English and Korean.

What’s new

• Fixed long fractions in Past Exams being cut off at the screen edges. They now shrink to fit, and wrap onto another line if still too long.
• Fractions no longer show grouping parentheses, just the numbers.
• Answer with an external keyboard: digits, Backspace and Esc for arithmetic; > < or the arrow keys to pick the larger side in Comparison and Past Exams.