The missing addend is 1.
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80 + 10 equals 90 so the missing value is zero, ie 80 + 10 = 90 - 0
-4 plus 10 equals 6.
x=10
12 + 10 + 11 equals 33
2 plus 3 equals 5 7 plus 2 equals 9 6 plus 9 equals 15 8 plus 4 equals 12 9 plus 7 equals 16 Am I missing something here? Probably. You say 2+3=5, but the question clearly states 2+3=10. Why would it say that? Suppose you had only one hand. You count 1,2,3,4,5,10,11,12. That last doesn't mean "twelve" as we know it, Jim. It means one hand (5), plus 2 spare ones. We could say: if 2+3=10, 5+2=12.