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- https://math.libretexts.org/Courses/Hartnell_College/Mathematics_for_Elementary_Teachers/04%3A_______Addition_and_Subtraction/4.04%3A_SubtractionYou may wonder why I wrote the addition statements in Exercise 14 with the plus sign on the left of the equals sign, unlike the way I happened to write the two addition facts in the fact family relati...You may wonder why I wrote the addition statements in Exercise 14 with the plus sign on the left of the equals sign, unlike the way I happened to write the two addition facts in the fact family relating 2, 6 and 8 at the top of the page. The missing addend approach states the answer to the subtraction problem is the number that when added to the number after the subtraction sign gives the number that is before the subtraction sign.
- https://math.libretexts.org/Courses/College_of_the_Desert/College_of_the_Desert_MATH_011%3A_Math_Concepts_for_Elementary_School_Teachers__Number_Systems/05%3A_Addition_and_Subtraction/5.03%3A_SubtractionFor this difference, in order to take one dot in the second level of subtrahend from the bar in the second level of the minuend, we must exchange the bar for five dots. First, the flat in Pile A must ...For this difference, in order to take one dot in the second level of subtrahend from the bar in the second level of the minuend, we must exchange the bar for five dots. First, the flat in Pile A must be exchanged for four longs, and one of those longs must be exchanged for four units.There is a box around the subset (Pile B) to be removed from Pile A note how it matches Pile B.
- https://math.libretexts.org/Courses/Coastline_College/Math_C104%3A_Mathematics_for_Elementary_Teachers_(Tran)/04%3A_______Addition_and_Subtraction/4.04%3A_SubtractionYou may wonder why I wrote the addition statements in Exercise 14 with the plus sign on the left of the equals sign, unlike the way I happened to write the two addition facts in the fact family relati...You may wonder why I wrote the addition statements in Exercise 14 with the plus sign on the left of the equals sign, unlike the way I happened to write the two addition facts in the fact family relating 2, 6 and 8 at the top of the page. The missing addend approach states the answer to the subtraction problem is the number that when added to the number after the subtraction sign gives the number that is before the subtraction sign.
