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Addition and Subtraction. To Any Place Value!. I CAN add and subtract whole numbers up to any place value. Real Life Application. Why is it important that we can add and subtract accurately? When and why do we add or subtract in everyday life?. ADDITION. - PowerPoint PPT Presentation
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Addition and Subtraction
To Any Place Value!
I CAN add and subtract whole numbers up to any place value
Why is it important that we can add and subtract
accurately? When and why do we add or subtract in everyday
life?
Real Life Application
There are simple rules to complete an ADDITION problem whether it is adding two-digit numbers or six-digit numbers.
However, there are some common mistakes to avoid!
ADDITION
As we go through this presentation together, you will be taking notes on ADDITION RULES.
Text that is in RED you will be writing in your notes!
Notes
Not lining up your problems by place value.
Example: 6,781 6,781 +10,955 +10,955
Incorrect answer 10,6331 correct answer 17,736
Line up the numbers involved NEATLY and CLEARLY by place value. Tip: use graph paper if you like!!
Common Mistake #1:
Forgetting to carry over by NOT writing it down.
Example: 3,909 3,909 +4,524 +4,524
Incorrect answer 7,423 correct answer 8,433
Always write-down what you are carrying over rather than just doing it in your head.
Common Mistake #2:
There are simple rules to complete a SUBTRACTION problem whether it is adding two-digit numbers or six-digit numbers.
However, there are some common mistakes to avoid!
SUBTRACTION
As we go through this presentation together, you will be taking notes on SUBTRACTION RULES.
Text that is in RED you will be writing in your notes!
Notes
Not lining up your problems by place value.
Example: 6,781 6,781 -1,320 -1,320
Incorrect answer 13,4781 correct answer 5,461
Line up the numbers involved NEATLY and CLEARLY by place value.
Common Mistake #1:
Flip-flopping the bottom and top numberExample: 9,853 9,853
-2,918 -2,918 Incorrect answer 7,145 correct answer 6,935
Do NOT flip-flop the bottom and top numbers—leave them in order.
Common Mistake #2:
Forgetting to reduce the number you borrow from.
Example: 964 964 -418 -418
Incorrect answer 556 correct answer 546
Borrow a 10 from a number to the left when needed. Lower the number you are borrowing from by 1.
Common Mistake #3:
Let’s get adding and subtracting!!
