X - 4 = 9 add 4 to each side X = 13 check 13 - 4 = 9 9 = 9
The formula is 9 : 100 4 : x x = 4 * 100 / 9 x= 400 / 9 x= 44.4444444444
10 x 4 x -9 =40 x -9 =-360
8 is twice as big as 4. 9 x 8 is twice as big as 9 x 4.
349 = (3 x 100) + (4 x 10) + (9 x 1)
13
13
X - 4 = 9 add 4 to each side X = 13 check 13 - 4 = 9 9 = 9
The formula is 9 : 100 4 : x x = 4 * 100 / 9 x= 400 / 9 x= 44.4444444444
10 x 4 x -9 =40 x -9 =-360
-9 x 4 = -36
4/9 of 27 = 4/9 x 27 = (4 x 27)/9 = 12
8 is twice as big as 4. 9 x 8 is twice as big as 9 x 4.
It is 9*(x*4) = 36*x
349 = (3 x 100) + (4 x 10) + (9 x 1)
1) x+9=13 (subtract 9) x=4 2) x+9=13 (divide by 9) x/9+1=13/9 (use Pascals theorem of 1) (x+4)/2=4 x+4=8 x=4
9 x 4 x 10 = 360