Skip Counting
Adding three 2-digit numbers
Using a Number Line
Result Unknown Word Problems
Start or Change Unknown Problems
100

________ 58 __________

Ten less          Ten more


48, 68

100

What is the sum?

        12 + 24 + 33 =

69

100

_____l______l______l______l______l______l_____

        35        __       __        38        39         __

36, 37, 40

100

There are 18 butterflies on the bush.  12 more join them.  How many butterflies are there?

Solve the problem and explain your thinking.

30

Accept reasonable explanations.

100

Some students are on the bus.  23 more students get on the bus.  Now there are 39 students on the bus.  How many students were on the bus to start?  Use drawings and equations to show your thinking.

16

For a correct answer they must have an equation AND show how they solved the problem.

200


10, 20, 30, _____, ______, _______


What are the next three numbers in this pattern?

40, 50, 60

200

What is the sum?

        34 + 32 + 23 =

89

200

_____l______l______l______l______l______l_____

        77        __       __        80        81         __

78, 79, 82

200

There are 36 butterflies in the garden.  37 more join them.  How many butterflies are there?

Solve the problem and explain your thinking.

73

Accept any reasonable explanations.

200

Ms. Cockrell's class has 12 stars on their star board. Ms. Moore's class has 9 more.  How many stars does Ms. Moore's class have?  Use drawings and equations to show your thinking.

21


For a correct answer they must have an equation AND show how they solved the problem.

300

46, 56, 66, _____, ______, _______


What are the next three numbers in this pattern?

76, 86, 96

300

What is the sum?

        28 + 21 + 32 =

81

300

_____l_________________l____________l____

         0                             60       

Place the following numbers on the number line:

30, 70, 80

_____l________l________l____l____l____

         0           30            60     70    80

300

Tolby solved the problem 22 + 48 by adding 

20 + 40 +2 + 8.  Is Tolby's strategy correct?  

Explain why or why not.

Yes


Accept any reasonable explanations.

300

Some students were in the cafeteria.  17 more students came into the cafeteria.  Now there are 98 students in the cafeteria.  How many students were in the cafeteria at first?  Use drawings and equations to show your thinking.

81

For a correct answer they must have an equation AND show how they solved the problem.

400

31, 41, 51, _____, ______, ______

What are the next three numbers in this pattern?


If the pattern continues will the number 94 be a part of this pattern?  Tell how you know.

61, 71, 81


No, because only the tens place is changing when I count by 10's.  The one's place has to be "1".

400

What is the sum?

        37 + 27 + 31 =

95

400

There were 58 students on the bus.  25 students got off the bus.  How many students are on the bus?  Use a number line to show your thinking.

33

Students will show their number lines and explain the jumps.

400

Joseph solved the problem 85 - 23 = ______ by writing, "I know that I need to add 2 to the 3 to make 5.  And I need to add 60 to 20 to make 80.  The answer is 62."  Is Joseph's strategy correct?  Explain why or why not.

Yes

Accept any reasonable explanation.

400

On the first day, Ms. Cecil's class raised $88 for the Read-a-thon.  Ms. Bergen's class raised $9 more.  How much money did Ms. Bergen's class raise on the first day?  Use drawings and equations to show your thinking.

$97

For a correct answer they must have an equation AND show how they solved the problem.

500

37, 47, 57, _____, ______, ______

What are the next three numbers in this pattern?


If the pattern continues will the number 97 be a part of this pattern?  Tell how you know.

67, 77, 87


Yes, because only the tens place is changing, so the ones are always "7".

500

What is the sum?

        38 + 32 + 44 =

114

500

Jade read for 28 minutes on Monday and 35 minutes on Tuesday.  How many minutes has he read so far this week?  Use a number line to show your thinking.

63

Students will show their number lines and explain the jumps.

500

Cole earned Cowboy Points at school.  He earned 15 tickets for Safety, 18 points for Respect, and 22 points for Acting Responsibly.  To find out how many tickets he has in all, Cole first adds 18 and 22.  Why might this be a good strategy?

Adding 18 and 22 first is a good strategy because they have "Friendly Numbers" in the ones place equalling 10.

500

Caryn is 48 inches tall.  Hafsa is 5 inches taller.  How tall is Hafsa?  Use drawings and equations to show your thinking.

53


For a correct answer they must have an equation AND show how they solved the problem.