Multiple choice What is the value of the missing digit? 555 + 9 _ 9 = 1544 6 7 8 9 Reveal answer Fill a bubble to check yourself C Correct answer Explanation 555 + 9 _ 9 = 1544 5 + 9 = 14 5 + 1 (carried) + 8 = 14 5 + 1 (carried) + 9 = 15 So, the missing digit is 8.