Addition
18 + 4 = ?
22
15 - 6 = ?
? = 9
Use 3 + 3 to get 3 + 4.
3 + 3 = 6
3 + 1 = 4
So 6 + 1 = 7
So 3 + 4 = 7
Sarah’s paper is 16 inches long. Sarah’s paper is 7 inches longer than her marker. How long is the marker? Write an equation to go with this problem.
9 inches
6 x 5 = ?
? = 30
26 + 13 = ?
39
21 - 8 = ?
21 - 8 = 13
Explain how to use 5 + 5 to solve 5 + 6 using the words "one more"
6 is "one more" than 5, so if 5+5 is 10, then 5+6 is 11.
Joe made a path that was 52 feet long. Then he decided he wanted it longer, so he added more. When he was finished, the path was 68 feet long. How many feet did Joe add to his path?
16 feet
Write three different addition equations for 17.
_____ + ______ = 17
_____ + ______ = 17
_____ + ______ = 17
10 + 7
11 + 6
etc..
Show your work: 47 + 39?
86 (with strategy)
Show your work. What is 34 - 18?
16 (and a strategy)
Explain how to solve 7 + 9 using 7 + 7
Ms. Banana has 182 books in her room. Of those books, 83 are math books. How many are science books?
99 Science Books
12-6 is a half fact. What are some other half facts?
14 - 7
16 - 8
20 - 10
10 - 5
8 - 4
Show your work: 77 + 77
77 + 77 = 154 (with strategy)
Show your work: What is 54 - 26?
54 - 26 = 28 (with strategy)
The "sum" of 8 + 8 is 16, so two less is 14.
Sarah’s Shrek doll is 48 inches long. Sarah’s squishy is 9 inches shorter than her journal. It is also much stickier. Sarah's journal is 24 inches long. How long is the squishy? Write an equation to go with this problem.
24 - 9 = 15 inches
Sarah said that all doubles facts have an odd sum. Do you agree or disagree? Why?
Disagree, they are all even (in groups of 2)
1,876 + 578 =
1,876 + 578 = 2,454
Show your work: 144 - 87?
144 - 87 = 57 (with strategy)
Using the words sum, addend, and one more; how do you use 6 + 6 to solve 6 + 7.
The sum of 6+6 is 12, the addend 7 is one more than 6, so the sum will also increase by 1. So 6+7 is 13.
Jimmy read 132 pages this week and 121 pages last week. Jody read 129 pages this week and 123 pages last week. Who read more pages in all during this week and last week? How many more pages?
Jimmy = 253, Jody = 252. Jimmy read 1 more page than Jody.
Do all doubles facts have an even sum? Why or why not?
Yes, because doubling is in groups of 2.