Which activity helps kindergartners decomposing number ten into number pairs?

• A. Counting to ten on fingers.
• B. Writing ten as a single digit.
• C. Using number cubes to show how to make ten in more than one way.
• D. Adding ten and zero.

Answer: (C)

Decomposing ten into number pairs means finding two addends that sum to ten. Using number cubes to show ten in more than one way gives a concrete, visual way to partition ten into different pairs, like 4 and 6 or 5 and 5. By forming these two-number groupings, kindergartners see that ten can be made in multiple ways, which strengthens understanding of part–whole relationships and number bonds to ten. The other activities don’t emphasize creating and comparing several two-number addends: counting to ten on fingers focuses on counting sequences, writing ten as a single digit targets numeral form, and adding ten and zero is a single-sum operation without exploring multiple pairings.