There are several ways you might think you could enter numbers in WebAssign, that would not be interpreted as numbers. N.B. There may be hints in RED!!!

You cannot have commas in numbers.
You cannot have a space in a number.
You cannot substitute the letter O for zero or the letter l for 1.
You cannot include the units or a dollar sign in the number.
You can have the sign of the number, + or -.

Which of the entries below will be interpreted as numbers?
5,000
-4.99
1.9435
$2.59
3.25E4
1.56 e-9 40O0
1.23 inches
1.56e-9

3 answers

Huh? Read the rules and check them one by one against each candidate.

I get as valid numbers:

-4.99
1.9435
3.25E4
1.56e-9

-4.99
1.9435
3.25E4
1.56e-9

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