Question 1 Complete the following addition exercises. 3 + 7 = 2 + 9 = 4 + 6 = 5 + 9 = 12 + 5 = 6 + 3 = 8 + 3 = 10 + 0 = 9 + 8 = 1 + 9 = 7 + 6 = 9 + 3 = 6 + 8 = 0 + 3 = 3 + 6 = 7 + 1 = 4 + 2 = 4 + 7 = 11 + 3 = 7 + 7 = 9 + 7 = 12 + 9 =