Adding and Subtracting Decimals

Essential Question: How do I add and subtract decimals? Always line up decimals Add and subtract like you always do Bring decimal straight down in your answers

Adding Examples: Put the first number on the top of the second number and line up the decimals You can add a zero to help keep everything lined up When adding or subtracting you always start from the right and work left.

When there is not a decimal put one behind the number. Line up the decimal Add a zero to line up everythin g

Same signs Add – keep the sign Add a zero to line up everythin g 0 Line up the decimal

Subtracting Examples: Put the first number on the top of the second number and line up the decimals Different signs Take difference

– (-7.81) Subtract to add when negatives are used. Different signs take difference Line up the decimal

28 – When there is not a decimal put one behind the number Add zeros to line up everything, then subtract

Magic Square The sum of each row, column, and diagonal must be the same. Sums to