yes
Sum
addend+addend=sum
correct.
Addend plus Addend equals Sum.
Addend plus addend equals sum.
missing addend
Sum
Addend + Addend=Sum
Addend
Both are called addend
Addend Addend Sum
addendaddend
Addend plus addend equals sum
addend+addend=sum
correct.
Addend plus Addend equals Sum.
Identity property