1. Bellwork Monday 8/13/18
Order these numbers from greatest to least 35.06, 35.7, 35.5,
Order 15, 14.95, 15.8, and from least to greatest 1) 2)
14.95, 15, 15.01, 15.8
35.849, 35.7, 35.5, 35.06
First, line up the decimal points.
Finally, use place value to compare the decimals. Always start from the left!!
Next, annex zeros so that each number has the same number of decimal places.

2. Place Value

3. Decimal Word Names Decimal word names always end in “-th” or “-ths”
one tenth
four hundredths

4. Representing the Decimal
The decimal is represented by the word “and” when writing and saying decimals in words.
2.1 = two and one tenth

5. How to write decimals numbers greater than one
To write a number containing a whole number and decimal follow these steps:
Write the whole number in words
Write “and” for the decimal
Write the numbers shown to the right of the decimal
Write the last place a digit occupies in the decimal (the farthest right)
32.46
thirty-two
and
forty-six
hundredths
32.46 = thirty-two and forty-six hundredths

6. Rounding Decimal Numbers
Sometimes close enough is good enough!

7. The Rounding Poem

8. Rounding Whole Numbers
Round 474 to the closest hundred.
474
Find your number
Look right next door
Four or less, just ignore
Five or more, add one more
474 Rounded to the hundreds becomes 500

9. 470 Round 474 to the closest 10’s 474 Find your number
Look right next door
Just ignore
470

10. What about decimal numbers
The same rules (and poem) apply!
Round to the closest hundredths
4.167
Find your number
Look right next door
5 or more, add 1 more
4.17

11. Round 42.73 to the closest tenth
If you are asked to round to the nearest tenth…….your answer stops at the tenth place!
Example:
Round to the closest tenth
would be 42.7

12. Special Case! Rounding a 9
Round to the hundredths
Since there is a “9” in the hundredths place consider the tenth and hundredths together 19
now look next door
do you leave it at 19 or move it to 20?
20 because 7 is 5 or more
2.20

13. 4.95 rounded to the nearest tenth is 5.0
Round 4.95 to the closest tenth
Since there is a “9” in the tenth spot consider the ones and tenths together…… should you leave it at 49 or move it to 50?
4.95 rounded to the nearest tenth is 5.0

14. Let’s Watch a Quick Video for more information

15. You try…. Round to tenths: Round to hundredths: 4.56 4.6 18.784 18.78
5.32
5.3
9.46
9.456
10.00
0.98
1.0
9.997

16. Least Common Multiple
You should already know how to find the least common multiple, but let’s do a quick review.

17. 1. Multiple The product of 2 or more whole numbers.
4: 4, 8, 12, 16, 20, 24, 28
We sometimes call this skip counting or counting by 4.
4x1
4x2
4x3
4x4
4x5
4x6
4x7

18. 12 and 24 are common multiples of 4 and 6
When a number is a multiple of two or more numbers
4: 4, 8, 12, 16, 20, 24, 28
6: 6, 12, 18, 24, 30, 36, 42
12 and 24 are common multiples of 4 and 6

19. 3. Least Common Multiple (LCM)
The least number greater than 0, that is a multiple of two or more numbers.
4: 4, 8, 12, 16, 20, 24, 28
6: 6, 12, 18, 24, 30, 36, 42
12 is the smallest (least) number both 4 and 6 have in common, so it is the least common multiple.

20. Do you remember how we use the least common multiple with fractions?
The least common denominator is the same as the least common multiple of the two denominators.
I’m going to show you an easier way than the list method to find the LCM/LCD of two numbers.

21. This method is referred to as the “cake method” or the “ladder method”.
As our denominators get larger, it can become more difficult to use the list method to find the LCM/LCD.
Step 1
Step 2

22. Step 3
Step 4

23. Step 5
Step 6

24. Let’s Watch a Quick Video for more examples

25. You Try…… Find the LCM/LCD1)
LCM/LCD is 24 2)
LCM/LCD is 120

26. Shoulder Partner Practice Use the ladder method to find the LCD in your notebook. We will review the answers as a class.

27. Homework