Practice
Direct Addition SubtractionPositive Big Friend 9Positive Big Friend 8Positive Big Friend 7Positive Big Friend 6Positive Big Friend 5Positive Big Friend 4Positive Big Friend 3Positive Big Friend 2Positive Big Friend 1Positive Big Friend RevisionNagetive Big friend 9Nagetive Big friend 8Nagetive Big friend 7Nagetive Big friend 6Nagetive Big friend 5Nagetive Big friend 4Nagetive Big friend 3Nagetive Big friend 2Nagetive Big friend 1Revision testPositive Small friend 4Positive Small friend 3Positive Small friend 2Positive Small friend 1Revision testNegative Small Friend 4Negative Small Friend 3Negative Small Friend 2Negative Small Friend 1Rivision TestPositive Combination 9Positive Combination 8Positive Combination 7Positive Combination 6Revision TestNegative Combination 9Negative Combination 8Negative Combination 7Negative Combination 6Revision Test