Question

I have a problem find the number in a open number line , my multiplication is 28x6 =168 how can I do this in a open number line ?

Answer 1

http://www.homeschoolmath.net/teaching/md/multiplication-number-line.php

Answer 2

And what happen if the number is 247 x 34 =8398

Answer 3

I wouldn't use a number line. I'd learn how to multiply the long way or use a calculator.