Base-10 blocks are most effective at teaching which concept?

• A. Arranging groups of base-10 blocks and writing numerals represented.
• B. Color-coding numbers by shade.
• C. Memorizing number facts without objects.
• D. Reading numbers in a book.

Answer: (A)

Base-10 blocks give a concrete way to see place value and the link between quantity and numeral symbols. By physically arranging units, tens, and sometimes hundreds, students observe that ten ones become a ten, and that the digits in a number represent how many tens and how many ones there are. Writing the numerals to match the groupings reinforces this connection and builds number sense, making the abstract idea of place value tangible. Color-coding by shade focuses on patterns rather than the value of positions; memorizing facts without objects misses the linkage between quantity and symbols; and simply reading numbers in a book doesn’t develop an understanding of how numbers are built from grouped units. So using base-10 blocks to arrange quantities and then record the corresponding numerals best supports understanding of place value.