Arith. [CROSS- 9.] = DUODECIMALS.
1703. T. N., City & C. Purchaser, 123. Cross-Multiplication is the Multiplying of Feet and Inches by Feet and Inches.
1751. Chambers, Cycl., Cross-multiplication … so called because the members are multiplied cross-wise.
1836. J. Gray, Arith., 95. Duodecimals, or Cross multiplication, is a rule by which artificers cast up the contents of their work.
