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The input type should display the same number of significant figures as typed in by the student. This input type always accepts floating-point numbers, regardless of the option set on the edit form.Also, students sometimes add units to dimensionless quantities (such as pH) and this input type will also enable a teacher to reject such input as invalid when the teacher does not use units. This normally forces the student to use units. The input will require the student's answer to have units if and only if the teacher's answer also has units. The input type will check both the teacher's answer and the student's answer for units.This input type is built closely on the algebraic input type with the following differences. Stack provides an input type to enable teachers to support students in entering answers with scientific units.
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These tests use (share code with) one of the existing numerical answer tests, such as NumSigFigs. STACK has answer tests which compare dimensional numbers.This function also handles the number coefficients automatically (e.g. STACK converts the student's answer to SI base units only.Students do not need to use this, but teachers can use it in question variables etc. To create, and to disambiguate, a dimensional numerical quantity from a number multiplied by units (a subtle distinction at best) STACK has a mostly inert function stackunits(12.1,m/s^2). Using multiplication in this way is ambiguous. In entry, the numerical part is bound to the units part with multiplication.There are options to condone a missing star, or to accept a space. Students type this value into STACK exactly as it is above.Let us assume that the correct answer is 12.1*m/s^2. If you are using the units answer tests then you need not worry about these internals. It essentially creates a single object representing a dimensional numerical quantity. However, having STACK split the student's answer this way is more reliable than teachers trying to find the "numerical part" themselves on a question by question basis. Essentially the function stackunits is inert, but does subtly modify the display. For example, in the expression 10*m/s the internal value from this input will be stackunits(10,m/s). Where num is the part interpreted to be the numerical portion, and units is the portion considered to be the units.