1) two + one a) three b) four c) two 2) three + two a) four b) five c) six 3) four + three a) three b) six c) seven 4) five + one a) six b) seven c) eight 5) seven + two a) eight b) nine c) ten 6) four - two a) one b) two c) three 7) five - one a) four b) six c) three 8) three - two a) one b) two c) three 9) nine - four a) five b) six c) seven 10) nine - five a) four b) five c) eight

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