1stellig

1stellig is a term used in Danish and Norwegian to describe numbers that consist of a single decimal digit. The English equivalent is one-digit or single-digit. In decimal notation, a one-stellig number is any integer whose decimal representation contains exactly one digit when ignoring the sign. Equivalently, the absolute value of the number is less than 10. This set includes the integers -9 through 9, with the positive one-digit numbers being 1 through 9, and 0 often included as a one-digit number as well.

In educational contexts, 1stellig is used when teaching place value, counting, and basic arithmetic. Activities often distinguish between one-digit numbers and multi-digit numbers to build an understanding of digit positions and value. The concept also appears in rounding, estimation, and number-range problems, where specifying “one-digit numbers” clarifies the allowable values.

In broader usage, the idea of one-digit numbers is tied to base-10 representation and the set of digits 0–9 that can appear in the single position of such numbers. The term is commonly found in Danish and Norwegian math curriculum materials, and its English counterpart appears in international mathematics resources.

See also: two-digit numbers, multi-digit numbers, decimal numeral system, place value.

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