# Where does the decimal go? This depends on which operation you are performing: »Addition »Subtraction »Multiplication »Division.

## Presentation on theme: "Where does the decimal go? This depends on which operation you are performing: »Addition »Subtraction »Multiplication »Division."— Presentation transcript:

Where does the decimal go? This depends on which operation you are performing: »Addition »Subtraction »Multiplication »Division

0 ADDITION 52.36 + 3.2 = Line up the decimals at the decimal point 52.36 (Put in any zeroes needed for place holders) + 3.2  Add the columns, then bring the decimal straight down 55 56.

0 SUBTRACTION 52.36 - 3.2 = Line up the decimals at the decimal point 52.36 (Put in any zeroes needed for place holders) - 3.2  Subtract the columns, then bring the decimal straight down 49 16.

MULTIPLICATION 3.2 x 0.6 = You do NOT need to line up the factors at the decimal point 3.2 Move the decimal that number of spaces X.16 192 Perform the multiplication steps one row at a time Add a zero for a placeholder in the 2nd row 032 Add the rows together 512 Count the number of digits behind the decimal in the two factors.

DIVISION with a decimal in the DIVIDEND 142.5 ÷ 3 = Write the problem, putting the dividend “inside the cookie jar” Bring the decimal straight UP 12 21 1 142.53 Perform the division steps as you would even without the decimal 4 22 7 5 5. 15 - - -

DIVISION with a decimal in the DIVISOR 142.5 ÷.3 = Write the problem, putting the dividend “inside the cookie jar” NOW Bring the decimal straight UP 12 21 1 142.5.3 Perform the division steps as you would even without the decimal 4 22 7 5 5. 15 - - - You need the number in the divisor to be a whole number. MOVE the decimal to the right the number of spaces needed to make it a whole number.. Now you have to move the decimal in the dividend the same number of spaces to the right.

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