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VOCABULARY Chapter 10 Addition and Subtraction Strategies VOCABULARY DEFINITION EXAMPLE add (addition) to join together sets to find the total or sum 2+3=5 doubles two addends that are the same number 8 + 8 = 16 doubles plus 1 two addends in which one number is one larger than the other 5 + 6 = 11 equals (=) having the same value as or is the same as 4 + 6 = 10 = is the equal sign estimate to find a number close to an exact amount Estimate: ♥♥♥♥♥♥♥♥♥ Answer: About 10 hearts fact family addition and subtraction sentences that use the same numbers; sometimes called related facts 4+5=9 9–5=4 5+4=9 9–4=5 pattern an order that a set of objects or numbers follows over and over. ABCABCABCABC... subtraction sentence an expression using numbers and the – and = sign. 10 – 4 = 6 sum the answer to an addition problem 7+1=8 8 is the sum