1 x 2 + 3 x 4 + 5 x 6 + 7 x 8 + 9 x 0

1 x 2 + 3 x 4 + 5 x 6 + 7 x 8 + 9 x 0
2 + 12 + 30 + 56 + 0
14 + 30 + 56 + 0
44 + 56 + 0
100 + 0 = 100

Following the PEMDAS rule, you multiply the numbers before adding them.

0
anything multiplied by 0 is 0 :)

100. Sometimes people think 0 because they see that 0 is multiplied, and in rush write 0.

0

0

Answer: 0

I'm guessing you just posted this for fun..

0 Lol

it's 100