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Addition
Subtraction
Estimation
Addition and Subtraction
100
37+41=
78
100
87-23=
64
100
Estimate the sum of 78+89.
170
100
43 -11=
What is 22?
200

79+34=

113

200

24-19=

5

200
Estimate the difference of 92-74.
20
200
12+6
What is 18?
300
What is a word or phrase you would find in a word problem that let's you know you should add?
total, sum, in all, altogether (any word from the poster is correct!)
300
102-38=
64
300
CJ read 15 hours last month. This month, CJ has read 28 hours. Estimate the number of hours he has read in the past two months.
about 50 hours
300
45+4=
What is 49?
400
What is the term for the answer to an addition problem?
Sum
400

The answer to a subtraction problem is called the ______________

Difference

400
Daniela has eaten 76 school lunches at Lakewood. Alagie has eaten 22 school lunches at Lakewood. About how many schools lunches have they eaten in all?
about 100 school lunches
400
63+45=
What is 108?
500
What term is used for the numbers you add together in an addition problem?
Addends
500
What is a word or phrase you would see in a word problem that means subtraction?
difference, how many more, less (any words from the poster!)
500

Ms. Herrion bought 57 pencils at the beginning of the year. At the end of the year, she only had 21 left. About how many pencils were used during the school year?

about 40

500
79+11=
What is 90?