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Mental Math Challenge: Add and Subtract app is the most challenging app for mastering addition and subtraction problems. This app is useful for all ages. Take the challenge and become a champion in addition and subtraction operations. Whoever become a champion in this challenge will be able to add and subtract with lightening speed. Mental Math Challenge: Add and Subtract Features:-Step by step instructions for easy mental addition and subtraction.-Separate lessons for 2 digit, 3 digit and 4 digit number operations.-Very interesting and easy to remember math tricks.-Challenging tests that have levels and achievements for motivation.-Each test has 3 levels with increasing difficulty.-Will be very useful for kids going for oral math quizzes-Will increase number sense in kids