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VOCABULARY Chapter 2 Understanding Addition VOCABULARY DEFINITION EXAMPLE add (adding, addition) To join together sets to find the total or sum. 2+3=5 addend Any numbers or quantities being added together. 2+3 (2 and 3 are addends) addition sentence An expression using numbers and the + and = sign. 4 + 6 = 10 equals (=) Having the same value as or is the same as. 4 + 6 = 10 = is the equal sign plus (+) A symbol to show addition. + is the plus sign sum The answer to an addition problem. 7+1=8 8 is the sum zero The number zero equals none or nothing. 0 Key Words and Catch Phrases for ADDITION Word Problems 1. 2. 3. 4. 5. 6. add altogether or all together both in all sum total