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Definitions
One-digit to Two-Digit Addition
Two-Digit Addition
Too Much Information
RaNdOm!
100
What is the OPPOSITE of addition?
Subtraction.
100
Use your white board to add 20+4
20 + 4 = 24
100
Use your white board to add: 39 + 29
39 + 29 = 68
100
What extra information is included in this problem? On Monday, 13 students ordered hot lunch. On Tuesday, 14 students ordered hot lunch. For lunch on Tuesday, grilled cheese was served. How many students ordered hot lunch?
You do not need to know what was served for lunch on Tuesday.
100
How many groups of ten are in the number 87?
There are 8 groups of ten in 87.
200
What do I get when I add two numbers together?
A sum.
200
Use your white board to add 34+5
34 + 5 = 39
200
Use your white board to add: 53 + 17
53 + 17 = 70
200
There are 24 girls on my sister's dance team. There are 11 players on my brother's soccer team. Three more players join the soccer team after their first game. How many players are on the soccer team now?
You do not need to know how many girls are on the dance team. There are 11 + 3 = 14 players on the soccer team.
200
CHALLENGE: How many ones are in the number 100?
There are ZERO ones in the number 100.
300
True or false? An addend is the number being added in a subtraction sentence.
False. An addend is the number being added in an ADDITION sentence.
300
Use your white board to add 71 + 9
71 + 9 = 80
300
Do I need to regroup when I add 45 + 54?
No, because 45 + 54 = 99
300
Why would a math problem have too much information?
To challenge us to only use the information that we NEED to find the answer.
300
This summer I went blueberry picking and picked 55 blueberries. My sister picked 40. My brother took a nap in the shade while we picked blueberries. How many blueberries did we pick in all?
You don't need to know that my lazy brother took a nap! My sister and I picked 55 + 40 = 95 blueberries in all.
400
What does it mean to regroup?
Regrouping is when you trade a group of ten ONES for ONE ten.
400
True or False? You have to regroup when you add 25 + 6.
True. You have to regroup by adding 1 group of ten to 20.
400
Use your white board to add 27 + 18
27 + 18 = 45
400
A Christmas cookie recipe calls for 24 m&m's. Another cookie recipe calls for 36 m&m's. I bought two bags of m&m's. How many m&m's do I need to make my cookies?
You do not need to know that I bought 2 bags of m&m's. I will need 24 + 36 =60 m&m's to make my cookies.
400
Regroup 8 tens and 10 ones. What number do you have?
Regroup 10 ones for 1 ten. You get 90.
500
What does TMI stand for?
It stands for Too Much Information.
500
Do you have to regroup when you add 45 + 4? How do you know?
You do not have to regroup when you add 45 + 4 because there is not more than ten ones.
500
CHALLENGE: Add 15 + 12 + 3
15 + 12 + 3 = 30
500
In October, our class read 14 books. In November, our class read 16 books. In December, our class read 10 books. How many books did we read in all?
You need all of the information in this problem. We read 14 + 16 +10 =3 books in all.
500
I need to regroup when I have _______ or more ones.
I need to regroup when I have TEN or more ones.