Write the subraction problem 604-357. describe how you will subtract to find the difference

The answer is 247. u could subtract to find the difference by doing place values. In the ones 4 cannot subtract 7 , so u would borrow from the ten,but it was a 0, so again u would go to borrow at the hundreds place. 6 will become 5. 0 will become 9. 4 will become 14. So in one place,14-7=7. In ten place,9-5=4. In hundred place,5-3=2. The answer is 247. Sorry if u don't understand some word, because I know little English only.

The answer is 109 times per second