Two-Digit Addition ChallengeVersion en ligne Fast two-digit addition practice. par Arnab Biswas 1 What is 23 + 47? a 65 b 72 c 68 d 70 2 What is 54 + 29? a 85 b 93 c 77 d 83 3 What is 37 + 46? a 79 b 78 c 90 d 83 4 What is 68 + 27? a 85 b 95 c 100 d 92 5 What is 15 + 58? a 78 b 68 c 74 d 73 6 What is 42 + 59? a 101 b 110 c 95 d 90 7 What is 31 + 67? a 120 b 99 c 75 d 98 8 What is 26 + 74? a 98 b 102 c 110 d 100 9 What is 49 + 28? a 77 b 76 c 80 d 70 10 What is 63 + 17? a 80 b 78 c 85 d 70