Addition/Subtraction Equations
___+___=12
Various responses
EX: 10 + 2, 11 + 1, 7 + 5
Laura has an apple tree. Today she picked 107 apples. Yesterday she picked 49 apples. How many apples does she have in all?
156 apples
Lisa spent 25 minutes on homework. Then she spent 30 minutes reading. Which equation represents how much time she spent on homework and reading together?
30-25=m
30+25=m
25-30=m
30+m=25
30+25=m
Explain how you can use a make a ten fact to solve 7+9. Include your answer when solving.
EX: I would add 3 to 7 to make 10. Then, I would take 3 from 9 to get 6. Then, I would add 10 + 6 to get 16.
_____ - _____ = 6
Various responses
EX: 7 - 1, 12 - 6
Bob walked a trail with various stops. The lengths were 20 mm, 12mm, 30mm, and 16 mm. How far did Bob walk?
78 mm
Billy is walking home. He spent 10 minutes walking. Then 12 minutes running. Which equation represents how much time he spend walking and running?
10+m=12
12-10=m
10+12=m
m-10=12
10+12=m
Todd has 209 flags. 107 of them are USA flags. The rest are Canada flags. How many are Canada flags?
209-107=102 are Canada flags
19-7=
12
Fred has $86 in his bank account. Tina has $63 in her bank account. How much more money does Fred have than Tina?
$23
Tom has 30 waffles on his plate. He has 10 in the toaster. Write an equation to show how many more waffles Tom has on his plate than in the toaster.
30-10=20
Billy has a book that is 113 pages long. Tommy has a book that is 86 pages long. How much longer is Billy's book than Timmy's?
113-86=27 pages longer
7= 13-___
6
33 cm
Sally says that all doubles facts (ex: 5+5) have even sums. Is this true? Use an equation to prove your thinking.
Yes, this is true.
EX: 1+1=2
2+2=4
3+3=6 and so on
Connor says that 8+9 is a double fact plus one. Is that true? Explain why or why not.
Yes, that is true. 8+8 is a double fact and one more than 8 is 9, so 8+9 is a doubles plus one fact.
____=5+3+6
14
Sarah went for a walk from her house. She went to her friends house which was 3 miles. Then, she went to the park which was 4 miles. She went to the store but doesn't know the distance. Her total distance was 12 miles. How long was it from the park to the store?
5 miles
10-5 is a half fact. Write down 2 more half facts.
8-4
16-8
Fred has 30 flowers. Sally has 19 flowers. Write an equation to show how many more flowers Fred has than Sally.
30-19=11 more flowers