addend
one of the two or more numbers that are added to determine a sum
addition
a mathmatical operation; the process of combining, or putting together, groups of objects or numbers
combine problem
an addition problem in which two quantities are put together to find a sum
model (noun)
a physical object, diagram, or picture that represents an amount, an expression, an equation, or a problem situation
model (verb)
to use physical objects, diagrams, or pictures to represent an amount, an expression, an equation, or a problem situation
number sentence
two expressions related by an equals symbol (=), a not-equal-to symbol (?), or an inequality symbol; for -example, 7-2=4+1; 5?4+2; 6+2>1+4
regroup; regrouping
to use place-value concepts to rename numbers, such as 1 ten and 3 ones = 13 ones; often used in addition and subtraction
sum
the solution to an addition problem
difference
the solution to a subtraction problem; the opposite of "sum
minuend
in subtraction, the quantity or number from which another number is subtracted.
mathmatical operation
a process or action, such as addition, subtraction, multiplication, or division, performed in a specified sequence and in accordance with specific rules; also called "mathematical operation