Examples of Subtraction

Examples of Subtraction - Subtraction of Whole Numbers...

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Subtraction of Whole Numbers Part – Whole Interpretation For this interpretation we are looking at the whole and at part of a set or measurement. We know what the whole is and we are trying to find a missing part (the part needed to make the whole). The following are three set model problems that illustrate the part-whole interpretation: (Change Unknown) (Part Unknown) (Start Unknown) Mary has 5 marbles. How many more does she need to have 12 marbles altogether? (i.e. part is known, whole is known, how much more is needed to get to the whole?) Mary has 12 marbles. 5 are blue and the rest are red. How many of the marbles are red? (i.e. part is known, whole is known, find the other missing part) Mary had some marbles. John gave her 5 more. Now she has 12 marbles. How many marbles did Mary have to begin with? (i.e. part known, whole known. Beginning part not known) 1
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Take-Away Interpretation For this interpretation we have one set or one measurement. We remove objects from the set / decrease the measurement.
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Examples of Subtraction - Subtraction of Whole Numbers...

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