A whole partitioned into four equal parts consists of four fourths, and each part is one-fourth of the whole. The learner determines how many fourths are missing when some equal parts are shown or identified, understanding that the missing parts complete the whole rather than treating any four pieces as fourths. This supports composing and decomposing wholes and later fraction comparison and operations; it does not include finding fourths of arbitrary quantities or adding unlike fractions.
A whole split into 4 equal parts has 4 fourths.
To find the missing fourths:
Example:
A rectangle is split into 4 equal parts. One part is missing:
There are fourths shown. The whole needs fourths.
So, 1 fourth is missing. The missing part must be one of the equal parts that completes the whole.
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