Arrange the numbers one on top of the other and line up the place values in columns. The number with the most digits is usually placed on top as the multiplicand. Multiply as above, but this time write your answers in a new row, shifted one digit place to the left. Use long addition to add your number columns from right to left, carrying as you normally do for long addition.

Proper fraction button is used to change a number of the form of 9/5 to the form of 1 4/5. A proper fraction is a fraction where the numerator (top number) is less than the denominator (bottom number). Starting with the ones digit of the bottom number, the multiplier, multiply it by the last digit in the top number Long multiplication means you're doing multiplication by hand. The traditional method, or Standard Algorithm, involves multiplying numbers and lining up results according to place value. These are the steps to do long multiplication by hand: Proceed right to left. Multiply the ones digit of the bottom number to the next digit to the left in the top number. If you carried a digit, add it to the result and write the answer below the equals line. If you need to carry again, do so. Insert a decimal point in the product so it has the same number of decimal places equal to the total from step 1.

Converters

Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off. When you've multiplied the ones digit by every digit in the top number, move to the tens digit in the bottom number.

Long multiplication with decimals using the standard algorithm has a few simple additional rules to follow.