Yes. It is a false sentence but a sentence all the same.
12
An Equation is a number sentence stating that two amounts are equal
A number sentence that shows two amounts are equal could be 5 + 3 = 8. This equation indicates that the sum of 5 and 3 is equal to 8. Another example is 12 - 4 = 8, which demonstrates that subtracting 4 from 12 also equals 8. Both sentences use the equal sign to express equality between the two sides.
a number sentence contains an equal sign
Is a number sentence that does not equal anything or has an equal sign.
Equation
A dodecagon can be drawn by drawing a polygon with 12 sides and 12 angles. All sides and angles have to be equal. * * * * * The first sentence is correct, the second is utter nonsense. There is no reason for a dodecagon - or a polygon with any number of sides - to have equal sides or equal angles.
Nothing, because there is no number sentence, only two integers.
A number sentence that equals or that has an equal sign.
12 is equal to a dozen
7 x 8 is not a number sentence because it does not have an equal sign (=) and it does not have a solution.
12/10 does not equal a whole number.