T1
Flexibly and confidently add and subtract multi-digit decimals *
NS.3
Lesson 1
Glue & Review
Notes
Place value chart:
* Helps us to read decimal numbers correctly
* Helps us to line up decimal numbers correctly when adding or subtracting
My Responsibilities
Due 10/23
1. In your notebook, make meaningful notes for your forgetful selves
2. CYUqs → Do in your notebook. You chose where you want to start. If you need help, get help. If someone else needs help, give help.
Rewrite the problem. Neatly show your thinking. Work top to bottom (up and down). Circle your answer.
p181: 1, 2, 3, 4, 5, 6, 10a; 183: 17, 18, 19, 20, 21, 22, 23, 24, 25; p182: 11 (Volume 1, Ch3-1)
Check answers as you’re working. If you make a mistake, fix it.
3. Stuck? Choose to persevere: review your thinking, try different approaches, ask for help, search
I added 3.1 and 4.65 and got an answer of 4.96 What was my mistake?
Summarize
Notes
When adding or subtracting decimals, remember to line up the decimal points. DO NOT align the numbers on the right-hand side, like you would with whole numbers
In a whole number, the decimal point is after the last digit (e.g., 15+4.88 should be written as 15.00+4.88).
When numbers have different numbers of digits after the decimal point, add zeros to make the place values line up correctly. For example, 0.5 can be written as 0.50 to align with 1.25
Sum: the answer to an addition problem
Difference: the answer to a subtraction problem
Term: a part of an expression that is separated by addition or subtraction signs (e.g. in the expression 3.2 + 5, 3.2 and 5 are terms)
Lesson 2
After completing the Check-your-understanding Questions, which were important for everyone to do?
Be sure to discuss page 181 #5
Direct Instruction
Notes
To find the distance between two positive numbers, we can subtract. If we subtract the same number from both numbers, the distance stays the same (even though both numbers shift to the left).
We can use this flexibility to avoid having to annex lots of zeros and regroup multiple times.
On the blank side, write: First name, last name, U4T1
Use the standard algorithm. Show your work. Circle your answer.
1) 0.231 + 5.8
2) 18 - 0.03
Lesson 1
Glue & Review
Notes
Place value chart:
* Helps us to read decimal numbers correctly
* Helps us to line up decimal numbers correctly when adding or subtracting
My Responsibilities
Due 10/23
1. In your notebook, make meaningful notes for your forgetful selves
2. CYUqs → Do in your notebook. You chose where you want to start. If you need help, get help. If someone else needs help, give help.
Rewrite the problem. Neatly show your thinking. Work top to bottom (up and down). Circle your answer.
p181: 1, 2, 3, 4, 5, 6, 10a; 183: 17, 18, 19, 20, 21, 22, 23, 24, 25; p182: 11 (Volume 1, Ch3-1)
Check answers as you’re working. If you make a mistake, fix it.
3. Stuck? Choose to persevere: review your thinking, try different approaches, ask for help, search
I added 3.1 and 4.65 and got an answer of 4.96 What was my mistake?
Summarize
Notes
When adding or subtracting decimals, remember to line up the decimal points. DO NOT align the numbers on the right-hand side, like you would with whole numbers
In a whole number, the decimal point is after the last digit (e.g., 15+4.88 should be written as 15.00+4.88).
When numbers have different numbers of digits after the decimal point, add zeros to make the place values line up correctly. For example, 0.5 can be written as 0.50 to align with 1.25
Sum: the answer to an addition problem
Difference: the answer to a subtraction problem
Term: a part of an expression that is separated by addition or subtraction signs (e.g. in the expression 3.2 + 5, 3.2 and 5 are terms)
Lesson 2
After completing the Check-your-understanding Questions, which were important for everyone to do?
Be sure to discuss page 181 #5
Direct Instruction
Notes
To find the distance between two positive numbers, we can subtract. If we subtract the same number from both numbers, the distance stays the same (even though both numbers shift to the left).
We can use this flexibility to avoid having to annex lots of zeros and regroup multiple times.
On the blank side, write: First name, last name, U4T1
Use the standard algorithm. Show your work. Circle your answer.
1) 0.231 + 5.8
2) 18 - 0.03