x = 0.436363636... (recurring). Prove algebraically that x can be written as 24/55.
We need to multiply x by powers of 10 in order to get the recurring part on its own after the decimal point, and then be able to eliminate it. 10x = 4.363636... and 1000x = 436.363636...So subtracting we get 1000x - 10x = 436.363636... - 4.363636...so 990x = 432.Then dividing both sides by 990, we get x = 432/990.We now just need to simplify this fraction: x = 432/990 = 216/495 = 72/165 = 24/55.So we have x = 24/55.
JP
Related Maths GCSE answers
All answers ▸How do you factorise and know if it is a difference of two squares ?
Find the area of the rectangle, in cm, with width 4x and length (y+5). Then calculate the area for x = 7 and y = 8.
Find the coordinates of the point of intersection of the lines 2x + 3y = 12 and y = 7 - 3x.
write (x+2)(x+3)(x+5) in the form ax^3+bx^2+cx+d