1. Ordering Decimals
Unit 3.1
Pages

2. Ordering Decimals.
Objective: Students will be able to place group of numbers using decimals on order of least to greatest on a number line.

3. .8 is equal to .80 4.67 < 4.97 Definitions.
Inequality: is a math sentence that shows number that are not equal (greater than, less than).
Equivalent: is when two decimals share the exact same value.
4.67 < 4.97
.8 is equal to .80

4. There are two ways that we can compare decimals.
Place Value
Number Line

5. 2.81 > 2.78 2.81 2.78 2.81 2.78 2.81 2.78 Time to Line Them UP!!
Place Value
Compare 2.81 to 2.78
Time to Line Them UP!!
2.81
2.78
2.81
2.78
2.81
2.78
Move from Left to right and determine which digit is larger. This will tell you which number has the greatest value.
2.81 > 2.78

6. When comparing more than one number with unequal digits add a
To any empty spot as a place holder.
Order from LEAST to GREATEST
14.35
14.30
14.05
14.05,14.30, 14.35,

7. When comparing more than one number with unequal digits add a
To any empty spot as a place holder.
Order from LEAST to GREATEST
16.67, 16.6, 16.07
16.67
16.60
16.07
16.07,16.60, 16.67

8. When comparing more than one number with unequal digits add a
To any empty spot as a place holder.
Order from LEAST to GREATEST
16.3, 16.35, 16.5
16.30
16.35
16.50
16.30, 16.35, 16.50

9. When comparing more than one number with unequal digits add a
To any empty spot as a place holder.
Order from LEAST to GREATEST
3.57, 3.75, 3.897
3.570
3.750
3.897
3.57, 3.75, 3.897

10. When comparing more than one number with unequal digits add a
To any empty spot as a place holder.
Compare LEAST to GREATEST
and
0.097
0.964
<

11. When comparing more than one number with unequal digits add a
To any empty spot as a place holder.
Compare LEAST to GREATEST
3.56 or 0.35
3.56
0.35
>

12. Rounding Decimals
Unit 3.2
Pages

13. Estimating Decimals.
Objective: Students will be able to estimate decimal sums, differences, products and quotients by using place value.

14. Wholes Parts of the Whole
A decimal helps us to see what numbers are WHOLE numbers, and what numbers are PARTS OF THE WHOLE.
Wholes
Parts of the Whole

15. Let’s review some definitions that
we should already know.
Sum
Difference
Product
Quotient
Addition
Subtraction
Multiplication
Division

16. We use decimal estimation in real word situations?
Can you think of any?

17. Estimate numbers with decimals by
rounding to the indicated place value.
Place
Value
ONES
Look at the digit to the right of your place value.
If it is a 5 or greater round up one number.
If it is less that 5 round down by adding zero’s.
4 + 6 = 10

18. #2.
Estimate numbers with decimals by
rounding to the indicated place value.
Place
Value
tenths
2.746 – 0.866
Look at the digit to the right of your place value.
If it is a 5 or greater round up one number.
If it is less that 5 round down by adding zero’s.
2.7 – = about 1.8

19. #3.
Estimate numbers with decimals by
rounding to the indicated place value.
Place
Value
ones
Look at the digit to the right of your place value.
If it is a 5 or greater round up one number.
If it is less that 5 round down by adding zero’s.
= about 12

20. We have burnt about ________
Someone who weighs about 90 pounds can burn the following calories:
Activity
Calories
Estimation
Bicycling
198.45
Playing Ice Hockey
210.60
Rowing
224
Water Skiing
194.4
198.00
216.00
224.00
194.00
~832.00
We have burnt about ________
calories in all.

21. Ella will run about _____ total miles .
#1.
Ella runs three days a week. She ran 3.62 miles on Monday, 3.8 miles on Wednesday, and 4.3 miles on Friday. About how any miles did she run on last week?
Days of the Week
Miles
Estimation
Monday
3.62
Wednesday
3.8
Friday
4.3
4.00
Ella will run about _____ total miles . 12

22. Ordering and Estimating Decimals 3.1 Pg. 102
Homework
Ordering and Estimating Decimals Pg. 102
6-8, 14-6, 25-27
Pg. 106
22-26
Due: Tuesday Nov. 3rd