Counting Math Example 4
Follow the full solution, then compare it with the other examples linked below.
Example 4
mediumA bag contains red, blue, and green marbles. There are 4 red, 3 blue, and 5 green marbles. Without counting the whole bag at once, use grouping to find the total.
Solution
- 1 Count each color group: red = 4, blue = 3, green = 5.
- 2 Add the groups: , then .
Answer
Grouping objects by category before counting is an efficient strategy. Adding the group totals gives the same result as counting every object individually, and is less prone to errors.
About Counting
Determining the total number of objects in a set by assigning exactly one number to each object in sequence, where the last number spoken equals the total count (the cardinality of the set).
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