 
Basic Number
Skills
Normed for ages 6:0 to 17:11.
Percentile ranks are also provided for each half of each grade from the second
half of kindergarten through the second half of grade 12.
Basic Number Skills is described on pages 261 to 266 in the DAS
Administration and Scoring Manual and
discussed on pages 7476 in the DAS Introductory and Technical Handbook.
The DAS Basic Number Skills achievement test requires the child to solve
computational problems presented in a workbook of problems. It taps concepts and
skills that underlie competence in arithmetical reasoning and calculations. The
48 items are arranged primarily in the order of their difficulty although
consideration for placement was also given to the sequence in which certain
skills are taught within a curriculum. The items cover recognition of printed
numbers, understanding of the four arithmetical operations (adding, subtracting,
multiplying, and dividing), and calculations using whole numbers, decimal
fractions, common fractions, and percentages.
Basic Number Skills utilizes a Basal and Ceiling format for testing (Basal: 5
or fewer passes within an 8item set; Ceiling: 3 or fewer passes within the
8item set).
Although it is useful to be able to compare ability and achievement tests
that were normed simultaneously on the same students, and the DAS Manual
provides achievement scores predicted from the GCA and Special Nonverbal
Composite (pp. 413414), there are very few math applications problems, so the
examiner will then be faced with the problem of finding a math applications
achievement test, which will not be normed on the same children as the DAS Basic
Number Skills subtest.
