1. Dividing by a Decimal Number
By: Mrs. Tumminello

2. Estimate First!
Before you solve a math problem, use estimation so you can see if your answer is REASONABLE!
Ex ÷ 1.05
16.8 is about 17 and 1.05 is about 1.
So 17 ÷ 1 = 17.
If you get an answer around 170, or 1.7 you know it isn’t correct 

3. X 2 = 44 X 2 16.8 ÷ 1.05 Do you know your 1.05 facts?
We don’t know our decimal facts, so we want to divide by WHOLE NUMBERS!
Create an equivalent division problem so that you can divide by a whole number!
X 2
= 44
X 2

4. What can we multiply the denominator by so it becomes a whole number?
X 100
X 100

5. Now that you have an equivalent division problem, you can solve like normal!1 6
- 105
630
- 630
Also, according to our estimation, our answer is reasonable 

6. For each problem, what would you multiply the numerator and denominator by so the denominator is a whole number?
X 100
X 1000
X 100
X 1000
X 10
X 10