Solution - Long multiplication

Start by multiplying the ones digit (9) of the multiplier 9,999,999 by each digit of the multiplicand 125, from right to left.

Multiply the ones digit (9) of the multiplicator by the number in the ones place value:
9×5=45

Write 5 in the ones place.

Because the result is greater than 9, carry the 4 to the tens place.

Multiply the ones digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×2+4=22

Write 2 in the tens place.

Because the result is greater than 9, carry the 2 to the hundreds place.

Multiply the ones digit (9) of the multiplicator by the number in the hundreds place value and add the carried number (2):
9×1+2=11

Write 1 in the hundreds place.

Because the result is greater than 9, carry the 1 to the thousands place.

1,125 is the first partial product.

Proceed by multiplying the tens digit (9) of the multiplier (9,999,999) by each digit of the multiplicand (125), from right to left.

Because digit (9) is in tens place, we shift partial result by 1 place(s) by placing 1 zero(s).

Multiply the tens digit (9) of the multiplicator by the number in the ones place value:
9×5=45

Write 5 in the tens place.

Because the result is greater than 9, carry the 4 to the hundreds place.

Multiply the tens digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×2+4=22

Write 2 in the hundreds place.

Because the result is greater than 9, carry the 2 to the thousands place.

Multiply the tens digit (9) of the multiplicator by the number in the hundreds place value and add the carried number (2):
9×1+2=11

Write 1 in the thousands place.

Because the result is greater than 9, carry the 1 to the ten thousands place.

11,250 is the second partial product.

Proceed by multiplying the hundreds digit (9) of the multiplier (9,999,999) by each digit of the multiplicand (125), from right to left.

Because digit (9) is in hundreds place, we shift partial result by 2 place(s) by placing 2 zero(s).

Multiply the hundreds digit (9) of the multiplicator by the number in the ones place value:
9×5=45

Write 5 in the hundreds place.

Because the result is greater than 9, carry the 4 to the thousands place.

Multiply the hundreds digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×2+4=22

Write 2 in the thousands place.

Because the result is greater than 9, carry the 2 to the ten thousands place.

Multiply the hundreds digit (9) of the multiplicator by the number in the hundreds place value and add the carried number (2):
9×1+2=11

Write 1 in the ten thousands place.

Because the result is greater than 9, carry the 1 to the hundred thousands place.

112,500 is the third partial product.

Proceed by multiplying the thousands digit (9) of the multiplier (9,999,999) by each digit of the multiplicand (125), from right to left.

Because digit (9) is in thousands place, we shift partial result by 3 place(s) by placing 3 zero(s).

Multiply the thousands digit (9) of the multiplicator by the number in the ones place value:
9×5=45

Write 5 in the thousands place.

Because the result is greater than 9, carry the 4 to the ten thousands place.

Multiply the thousands digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×2+4=22

Write 2 in the ten thousands place.

Because the result is greater than 9, carry the 2 to the hundred thousands place.

Multiply the thousands digit (9) of the multiplicator by the number in the hundreds place value and add the carried number (2):
9×1+2=11

Write 1 in the hundred thousands place.

Because the result is greater than 9, carry the 1 to the millions place.

1,125,000 is the fourth partial product.

Proceed by multiplying the ten thousands digit (9) of the multiplier (9,999,999) by each digit of the multiplicand (125), from right to left.

Because digit (9) is in ten thousands place, we shift partial result by 4 place(s) by placing 4 zero(s).

Multiply the ten thousands digit (9) of the multiplicator by the number in the ones place value:
9×5=45

Write 5 in the ten thousands place.

Because the result is greater than 9, carry the 4 to the hundred thousands place.

Multiply the ten thousands digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×2+4=22

Write 2 in the hundred thousands place.

Because the result is greater than 9, carry the 2 to the millions place.

Multiply the ten thousands digit (9) of the multiplicator by the number in the hundreds place value and add the carried number (2):
9×1+2=11

Write 1 in the millions place.

Because the result is greater than 9, carry the 1 to the ten millions place.

11,250,000 is the fifth partial product.

Proceed by multiplying the hundred thousands digit (9) of the multiplier (9,999,999) by each digit of the multiplicand (125), from right to left.

Because digit (9) is in hundred thousands place, we shift partial result by 5 place(s) by placing 5 zero(s).

Multiply the hundred thousands digit (9) of the multiplicator by the number in the ones place value:
9×5=45

Write 5 in the hundred thousands place.

Because the result is greater than 9, carry the 4 to the millions place.

Multiply the hundred thousands digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×2+4=22

Write 2 in the millions place.

Because the result is greater than 9, carry the 2 to the ten millions place.

Multiply the hundred thousands digit (9) of the multiplicator by the number in the hundreds place value and add the carried number (2):
9×1+2=11

Write 1 in the ten millions place.

Because the result is greater than 9, carry the 1 to the hundred millions place.

112,500,000 is the sixth partial product.

Proceed by multiplying the millions digit (9) of the multiplier (9,999,999) by each digit of the multiplicand (125), from right to left.

Because digit (9) is in millions place, we shift partial result by 6 place(s) by placing 6 zero(s).

Multiply the millions digit (9) of the multiplicator by the number in the ones place value:
9×5=45

Write 5 in the millions place.

Because the result is greater than 9, carry the 4 to the ten millions place.

Multiply the millions digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×2+4=22

Write 2 in the ten millions place.

Because the result is greater than 9, carry the 2 to the hundred millions place.

Multiply the millions digit (9) of the multiplicator by the number in the hundreds place value and add the carried number (2):
9×1+2=11

Write 1 in the hundred millions place.

Because the result is greater than 9, carry the 1 to the billions place.

1,125,000,000 is the seventh partial product.

1125+11250+112500+1125000+11250000+112500000+1125000000=1249999875 long addition steps can be seen here

Because we have 1 digit(s) to the right of the decimal point in the numbers that are being multiplied, we move the decimal point 1 time(s) to the left (reducing the result by the factor of 10) to get the final result:

The solution is: 124999987.5