One, two, two, two, four.

One, three, two, three, six, three, three and nine.

Fourteen is four, two, four, eight, three, four, twelve, four, forty-six.

15 is 525, 135, 1525, 4525525.

16 is 62, 62, 38, 46, 24, 56, 36, 636.

Obtained .51989.99999998985

18 get 82 86 384 48312 584 68418 78516 8864.

1992 983927 4936 594 15 6954 796 13 8972? 998 1.

Extended data:

Four operational relationships:

Multiplication is a simple operation of addition and division is a simple operation of subtraction. Subtraction and addition are reciprocal operations, and division and multiplication are reciprocal operations. Addendum+Addendum = sum, minus-minus = difference.

One addend = sum-another addend, subtraction = minuend-difference, minuend = difference+subtraction.

Factor × factor = product, one factor = product ÷ another factor, dividend ÷ divisor = quotient, divisor = dividend ÷ quotient, dividend = quotient × divisor.

Baidu encyclopedia-multiplication formula table