Fill in the missing number in each equation
18 = ____ + 6
12
17 - 9 = ___
8
Sam drew a line that was 48 cm long. then he decided he wanted a longer line, so he added some more to it. When he was finished, his line was 73 cm long. How many centimeters did he add to his line?
25 cm
Della says that 7 + 8 is a Doubles Plus One fact. do you agree with Della? Why or why not?
Yes, Della is correct. 7 + 7 is a Doubles fact. 7 + 8 is one more than 7 + 7, so it is a Doubles Plus One fact.
___ + 5 = 14
9
15 - 7 = ____
8
Sara measured a poster. The first side of the poster was 81 cm long. The second side was 53 cm long. How much longer was the first side than the second side of the poster?
28 cm
Rosa read 129 pages last week and 124 pages this week. Amy read 127 pages last week and 109 pages this week. Who read more pages in all during this week and last week? How many more pages did she read? Show your work with numbers, pictures, or words.
Rosa: 129 + 124 = 253
Amy: 127 + 109 = 236
253 - 236 = 17 pages, Rosa read 17 more pages than Amy.
7 + 8 = ____ + 9
6
12 - 8 = ____
4
Mr. Malik has 215 math and science books in his classroom library. Of the books, 93 of them are math books. How many are science books?
122 science books
___ + ___ = 15
9 + 8 = ____
17
16 - 7 = ____
9
Write and solve an equation to match this problem. "The coach has 16 tennis balls and 9 ping-pong balls in a bag. How many more tennis balls than ping-pong balls are in the bag?
16 - 9 = 7 tennis balls
___ + ___ = 24
Answers will vary.
4 + 2 + 2 + 6 = ____
14
20 - 10 = ____
10
16 - 8 is a Half fact. Write two other Half facts.
20 - 10
10 -5
8 - 4
6 - 3
other answers will vary.
____ - ____ = 4
Answers will vary