1. Study your factors and multiples (LCM and GCF).
Bell Ringer
Study your factors and multiples (LCM and GCF).

2. Homework
Evaluate the sum

3. MCC6.NS3 The Number System
Add & Subtract Decimals
Standard:
MCC6.NS3 The Number System
Fluently add, subtract, multiply and divide multi-digit decimals using the standard algorithm for each operation.
I Can:
Estimate the sum and difference with decimals.
Add and subtract decimals

4. TIPS for adding and subtracting decimals
First, line up the decimals.
2. Add or subtract from right to left. Regroup if necessary.
3. Bring the decimal straight down in your answer.

5. You can add a zero to help keep everything lined up
Put the first number on the top of the second number and line up the decimals.
Adding
Examples:
You can add a zero to help keep everything lined up
When adding or subtracting you always start from the right and work left.
15 85 .
Line up the decimals.

6. You can add a zero to help keep everything lined up
Put the biggest number on the top of the second number and line up the decimals.
Subtracting
Examples:
You can add a zero to help keep everything lined up
When adding or subtracting you always start from the right and work left. .
11 25
Line up the decimals.

7. Adding and Subtracting
Decimals = = = = = = = = = =

8. Bell Ringer Tuesday

9. Homework
Solve the sum or difference
– 5.25

10. Go back to Monday’s
work period.

11. Bell Ringer Wednesday
Some SCIS 6th graders went to a math competition. Devon completed 20 problems in 12.6 seconds. Trent completed 20 problems in 15.2 seconds.
What is the difference in Devon and Trent’s time?
What is Devon and Trent’s time collectively.

12. Homework
Be sure you receive a handout. Glue it to your homework page for the week.

13. One event in competitive swimming is the women’s 100-meter butterfly
One event in competitive swimming is the women’s 100-meter butterfly. The table shows the times of different swimmers at a recent Olympics.
Swimmer’s
Time (s)
Brittany
56.73
Markayla ?
Jasmine
58.10
It took Markayla 0.37 seconds longer to finish than Brittany. What was Markayla’s time , in seconds?
At a SCIS meet, a swimmer swam the women’s 100-meter butterfly in seconds. How many seconds faster did Jasmine swim her race?

14. Swimmer’s
Time (s)
Brittany
56.73
Markayla ?
Jasmine
58.10
It took Markayla 0.37 seconds longer to finish than Brittany. What was Markayla’s time , in seconds?
At a SCIS meet, a swimmer swam the women’s 100-meter butterfly in seconds. How many seconds faster/ did Jasmine swim her race
Tens
Ones
Tenths
Hundredths 5 6 7 3  5 1
Tens
Ones
Tenths
Hundredths 5 8 1 4 3  1 2 7 6 - +

15. You Try

16. Word problems and algorithm.
Additional Practice
With
Word problems and algorithm.
Make up problems

17. Bell Ringer Thursday
x 8
x 13

18. Homework
x 4
x 1.2

19. Multiply & Divide Decimals
Standard:
MCC6.NS3 The Number System Fluently add, subtract, multiply and divide multi-digit decimals using the standard algorithm for each operation.
I Can:
Multiply decimals by whole numbers.
Multiply two decimals
Estimate the product of decimals.

20. Multiplying Decimals
When multiplying a decimal by a decimal, multiply as whole numbers.
To place the decimal point, find the sum of the number of decimal places in each factor.
The product has the same number of decimal places.

21. Multiplying Decimals
For example: Find 4.2 x 6.7
4.2
x 6.7
294
252
28.14
One decimal place
One decimal place
Two decimal places
The product is

22. Example: 5.63 x 3.7 4 2
two
5.63
5.63 x
3.7 x
3.7
one 1 1 39 4 1 1 + 16 8 9 2 . 8 3 1
three

23. Dividing Decimals “Swingin’ Monkeys”

24. Swinging Monkeys! Monkey See; Monkey Do!
Follow these steps and you will be great at dividing decimals! Remember: Whatever the OUTSIDE monkeys do – the INSIDE monkeys do also!
Monkey See;
Monkey Do!

25. Division Vocabulary “Roof” Quotient “Outside” Divisor “Inside”
Dividend

26. Division Vocabulary
12.64 ÷ .2
12.64 divided by .2

27. Steps in Dividing Decimals
Make the divisor (outside number) a whole number by moving (swingin’) the decimal to the right as many places as it takes to make it a WHOLE NUMBER.
In MONKEY TERMS: Whatever the outside monkey does (how far it swings) the inside monkey does also. Then the monkey climbs up and sits on the roof!

28. Moved (swung) the decimal point 1 place to the right
Swingin’ Monkeys
Moved (swung) the decimal point 1 place to the right
Divisor
Swingin’
Monkey

29. Steps in Dividing Decimals
2. Move (swing) the decimal point in the dividend the same number of places as the divisor.
Dividend
Moved (swung) the decimal point 1 place to the right

30. Steps in Dividing Decimals – Swingin’ Monkeys
3. Place (swing) the decimal point in the answer (quotient) lined up with the decimal point in the dividend (on the roof).

31. Steps in Dividing Decimals
4. Now, divide as usual!

32. Steps in Dividing Decimals
4. Divide the numbers. Make sure the decimal point stays lined up. 6 3 2 12 6 6 4

33. Bell Ringer Friday
2.15 x 5.4
24 ÷ 0.12

34. Homework 1. Find the product 12.54 X 2.3 2. Find the quotient
1.530 ÷ 0.5
   

35. Let’s Practice
Remember: The more neatly you write and keep the numbers lined up, the BETTER!

36. Lets Practice Together
14.2 ÷ 0.2 =
25.5 ÷ 1.5 =

37. You Try
0.12 ÷ =
0.9 ÷ .972 =

38. More Practice
42.0 ÷ 0.3
14.56 ÷ 2.8
5.28 ÷ 4.8

39. Practice
1.75 x 4.6
0.54 ÷ 0.03
– 6.54