Addition or Subtraction?
If someone gives you 4 stickers, is that addition or subtraction?
Addition!
If one number is smaller, what do we do to get a bigger number?
You ADD! Addition is joining numbers!
What does the + symbol mean?
Add / put together!
“Juan had 8 blocks. He gets 2 more.”
What should you do: add or subtract?
Add ! Juan is getting more blocks!
What do we call the missing number in an equation?
The missing part / addend!
If you lose 3 pencils from your desk, is that addition or subtraction?
Subtraction!
If one number is bigger, what do we do to get to the smaller number?
Subtract!
What does the - symbol mean?
Subtract!
“There were 14 birds. Some flew away.”
Do we add or subtract?
We would Subtract!
If you know 6 + 3 = 9, what subtraction fact goes with it?
The subtraction fact that would go with this is:
9 - 3 = 6
OR
9 - 6 = 3
You have 6 crayons. You need to find “how many more” crayons you need to reach 10. Can you add, subtract, or both to find the answer?
Both!
True or false: Any large number can be broken into a smaller number and another part.
True!
What is the missing part in this equation:
7 + ___ = 10
3 !
Because 7 + 3 = 10 !
“You have 5 markers and want 10. How many more do you need?”
Do we: add or subtract?
You would ADD!
What does this mean: ___ + 5 = ___ ?
The second number is 5 more than the first number.
You have 12 apples and eat 5. What kind of situation is this: adding or subtracting?
Subtraction ! (Take away)
If 12 is 5 more than 7, what is 7?
7 is 5 less than 12!
Because:
If we know that 7 + 5 = 12, we also know that 12 - 7 = 5, so 7 is 5 less than 12!
What is the missing part in this equation:
___ - 4 = 2
6 !
Because 6 - 4 = 2
“Maya has 12 candies. Jayden has 9. How many more candies does Maya have?”
Would we add or subtract to figure out the answer?
We would SUBTRACT to compare!
12 - 9 = ___
What does this mean: ___ – 4 = ___ ?
The second number is 4 less than the first number.
You know the total is 15 and one part is 9. Will adding or subtracting help you find the missing part?
Subtracting! Because you need to take 9 away from 15 to find how many are missing!
If 10 is 4 more than 6, what is 6?
6 is 4 less than 10!
Because:
If we know that 4 + 6 = 10, we also know that 10 - 6 = 4, so 6 is 4 less than 10!
Do 6 + 4 = 10 and 10 – 6 = 4
Show the same number relationship? Yes or no!
Yes! 6 + 4 = 10 AND 10 - 6 = 4 show the same number relationship!
What would the equation for this story look like? Use your whiteboard to figure out the answer!
“There are 17 cookies. 5 are eaten. How many are left?”
17 - 5 = 12
True or false: Every subtraction sentence can be turned into an addition sentence.
True !