Completar frases Add Sub VocabVersión en línea add sub cbe por Demery Bader-Saye 1 difference sum digit fact strategy family Addition is when we combine two or more numbers to find the sum , or total . When we compare the difference between two numbers , it is called subtraction . The answer to an addition problem is called the , and the answer to a subtraction problem is called the . A is a symbol ( 0 - 9 ) used to make a number . A is a group of related math facts made by the same numbers . A careful plan used to meet a goal is called a .
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