1. Math Mystery

2. Greater than or Less than
Compare whole #’s first
If the same – compare the # after the decimal (tenths place)
Then move to the hundredths
If needed – add 0’s to make #’s
have the same amount of digits,
then compare
>
<

3. Powers of 10 Rule
Multiply = move decimal to the RIGHT the same # of places as the # of zeros
EX: X 10
EX: X 10 =
Answer: 65.89
1 zero
 1 time

4. Powers of 10 Rule
Divide = move decimal to the LEFT the same # of places as the # of zeros
EX: X 1000
EX: X 1000 =
Answer:
3 zeros
 3 times

5. 2 4 6 . 8 5 1 Place Value Decimal Point Thousandths Hundredths
Thousands
Hundreds
Tens
Ones
Decimal Point
Tenths
Hundredths
Thousandths 2 4 6 . 8 5 1

6. Addition/Subtraction Decimals
Line up the decimals
Fill in spaces with 0’s
Add or subtract
Bring down the decimal
5.94
8.04
15.90
11.75

7. Multiplying Decimals Put the # with the most digits on top
Multiply like normal
Count #’s behind decimal
Count same amount from the right in the answer and place the decimal
digits behind
X digit behind
digits from right

8. Dividing Decimals Make divisor whole # by moving decimal
Do the same in the dividend
Bring decimal straight up
Divide
.2 ÷  2 ÷ 34.8 ≈ 0.057  