then comes the tens-column. the tens-column so far contains only one digit: the tens-digit of the multiplicand (though it might contain a carry digit under the line). find the product of the multiplier and the tens-digits of the multiplicand. then, if there is a carry digit (superscripted, under the line and in the tens-column), add it to this product. if the resulting sum is less than ten then write it in the tens-column under the line. if the sum has two digits then write its last digit in the tens-column under the line, and carry its first digit over to the next column: in this case the hundreds column.