Decimal Operations

The next unit is over decimals.  Here are some things to remember:

Addition-

1. line up the decimals
2. look for words like added together, gave, found, total, etc.

Subtraction-

1. line up the decimals
2. look for words like difference, how much farther, what is left, pays, owes, etc.

Multiplication-

1. line up the farthest RIGHT digit in your number
2. look for words like per (as in price PER pound), area, product, total, how many times, altogether, twice, multiplies, in all.

Division-

1. put the 1st number inside the "house", the second number outside.  If there is a decimal in the outside number, move it right until it hits the "door".  For however many times you moved it outside, move it inside the same amount, then put it on top of the "house"
2. look for words like quotient, average, amount per, per, ratio, divided by, out of

Here is one last thing for multiplication and division:

Now look at the statement and question.
Find the word “each”.
If “each” is in the statement -- multiply.
If “each” is in the question -- divide.