Question

cross out any equation below in which 10 is not a factor. 3×10=30, 10=5×2, 50=10×5, 10×0=0

Answer 1

The equation:

$10\cdot0=0$

does not have 10 as a factor. This comes from the fact that if we make the operations we get:

$0=0$

and clearly 10 is not a factor of 0.