400000/x=100/10 <span>(400000/x)*x=(100/10)*x - </span>we multiply both sides of the equation by x <span>400000=10*x - </span>we divide both sides of the equation by (10) to get x <span>400000/10=x </span> <span>40000=x </span> <span>x=40000</span>
The answer is: "40,000,000" (40 million). ___________________________________________________ Explanation: _____________________________________________________ (1/10) of a number = (that number divided by 10) ; ____________________________________________ So, write that number: ________________________ " 400,000,000" . That number is 400 million, that is, a "4" following by "eight (8) zeros". ______________________ We can divide this number by "10", by move the decimal place back one place. In this case, the 'implied" decimal place is at the end of the number, so instead of a "4 following by eight (8) zeros" ; or:
400000000; we divide by "10"; by rewriting as a 4 following by "seven (7) zeros": ____________________________________________ 4000000.0 ; or: "40,000,000.0; or; __________________________________________________ "40,000,000" (40 million). which is our answer. ______________________________________________
