Students who make errors expressing words as numbers can benefit from:

• A. Arranging groups of base-10 blocks and writing numerals represented.
• B. Reading books with pictures.
• C. Learning to spell number words.
• D. Counting aloud while clapping.

Answer: (A)

Translating number words into digits depends on understanding place value. Using base-10 blocks gives a concrete way to represent tens and ones, so students can physically build the amount described by a word and then write the matching numeral. This makes the link between the word form and the symbol form explicit, helping them see that words like “twenty-one” map to two tens and one one, i.e., the numeral 21. Other activities like reading with pictures, spelling number words, or clapping through counts don’t directly reinforce this word-to-digit mapping, so they’re less effective for addressing errors in expressing words as numbers.