4/9 multiplied by 1/8

Multiply the top parts together (numerators) : 4 * 1 = 4

Multiply the bottom parts together (denominators) : 9 * 8 = 72

Put the top part (4) over the bottom part (72) : 4/72

Then, since four goes into 72 eighteen times, and four goes into itself once, you can reduce the fraction down to:

1/18