<P> A. Divide 288 by 2 . We can divide each digit individually to get 144 . (Dividing smaller number is easier .) </P> <P> B. Multiply by 10 . Add a zero to yield the result 1440 . </P> <P> Since 9 = 10 − 1, to multiply a number by nine, multiply it by 10 and then subtract the original number from the result . For example, 9 × 27 = 270 − 27 = 243 . </P> <P> This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2 × 27) = 270 − 54 = 216 . </P>

One number is equal to 6 times another number plus 7