In the table in the middle of the page you’ll see:

100 divided by 50 equals ___________ remainder ______
100 % 40 = ____________

The 50 should match the 40 so it should either be:

100 divided by 50 equals ___________ remainder ______
100 % 50  = ____________

or

100 divided by 40 equals ___________ remainder ______
100 % 40  = ____________

Incidentally, the answers are:

100 divided by 50 equals 2 remainder 0
100 % 50  = 0
100 divided by 40 equals 2 remainder 20
100 % 40  = 20