Math Facts
9+8=
17
4+8+2+6=
20
Is 2 even or odd?
even
John's book is 15 centimeters long. The book is 5 centimeters longer that John's pencil. How long is his pencil? Which equation represents the problem?
A. 15+5=p
B. p+15=5
C.p+5=15
C. p+5=15
Write four equations for the numbers 2,4,6
2+4=6
4+2=6
6-2=4
6-4=2
13-9=
4
9+7=10+_
6
Is 5 even or odd?
Odd
Christine drew a line that was 48 cm long. Then she decide that she wanted a longer line. So she added some more to it. When she was finished, her line was 73 cm long. How many centimeters did she add to the line?
25 cm
73-48=
Write four equations for the numbers 3,6,9
3+6=9
6+3=9
9-3=6
9-6=3
=20-11
9
_+5=14
11
Is 20 even or odd?
even
Abby 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?
81-53=28cm
Write four equations for the numbers 10,8,18
10+8=18
8+10=18
18-8=10
18-10=8
14-7=
7
18=_+6
12
Kyle says that when you add two even numbers, you always get an even number. Do you agree with him? Show evidence to support your answer.
Yes he is correct.
2+2=4
4+4=8
6+6=12
Ms. Sima has 215 math and science books in her classroom library. Of the books, 82 of them are math books. How many of them are science books?
215-82=133 Science books
8+12=20
12+8=20
20-8=12
20-12=8
=18-6
12
7+8=_+9
6
Megan says that the sum of an even number and 1 is always even. Do you agree? Write three equations are proof.
No Megan is incorrect
2+1=3
4+1=5
8+1=9
Mr. Terry 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 more tennis balls
Write your own fact family!
Answers will vary