Balancing Equations
17= = 10 + ___
7
Tyler measured his skateboard and it is 43 cm long. His little brother's skateboard is 21 cm long. How much longer is Tyler's skateboard than his brother's?
22 cm
How can you use 7 + 7 to help you solve 7 + 6?
Doubles fact; 7+7=14 so just take 1 away to get 13
John's book is 18 cm long. The book is 9 cm longer than John's pencil. How long is his pencil? Choose all equations that match.
a. 18-9=p
b. p+18=9
c. 9-p=18
d. p+9=18
a and b
How many legs do spiders have?
8
8 + 7 = 10 + ____
5
Suzie works at the game store. He has 25 dollars is the cash register. He collected 6 dollars from a customer and gave 7 dollars to his manger. How much money was left in his cash register?
24 dollars
Show two way to solve 12 - 7
Number line, other strategy
Kendra has 13 marbles in her collection. Kyle has some marbles in his collection. Together, Kendra and Kyle have 30 marbles. Which of the following equations represents this situation?
a. 13+m=17
b. 30-17=m
c. 13+m=30
d. m-17=30
b and c
What is the bottom layer of soil?
Bedrock
____ = 21 - 11
10
Last weekend at the amusement park Caleb rode a roller coaster for 17 minutes, the carousel for 12 minutes, and the zip line for 11 minutes. How long did Caleb spend on these three rides?
40 minutes
Sarah says that all +0 facts have odd sums. Is she correct, yes or no? Why or why not?
No she is not correct. Because 4+0 = 4 (even) but 7+0=7 (odd)
Kaylee has 22 cards in her collection. Josh has some cards in his collection. Together, Kaylee and Josh have 40 cards. Which of the following equations represents this situation?
a.22+30=c
b.22+c=30
c.22-c=30
d.30-22=c
b and d
Which rock is formed by compacting different sediments?
Sedimentary rock
___ = 13 - 9
4
Raven and Todd are playing a game with marbles. There are 20 marbles in all. After one game Raven has 13 marbles and Todd has the rest. How many marbles does Todd have?
7 marbles
What is a doubles fact? Do they have odd or even sums?
When you add the same number together (double it). They have even sums.
Teddy has read 53 pages of his book. In all, there are 95 pages in the book. How many more pages does he have to read? Choose which equations match.
a.53+p=95
b.95+53=p
c.95-53=p
d.p-53=95
a and c
What is the top layer of soil that has lots of nutrients?
Humus
12 - 6 = ____
6
Jim read 58 pages of his book last week and 67 this week. Steven read 45 pages of his book last week and 32 this week. Who read more? How many more?
Jim read more. He read 48 more pages
What fact strategy can help you solve 9+8?
Doubles fact, near doubles fact
Bob and Regina like to collect cars. Bob has 34 cars in his collection. Regina has some in hers. All together they have 60 cars. How many cars does Regina have? Choose which equation matches?
a. 60+34=c
b.34-60=c
c.34+c=60
d.60-c=34
d and c
How many days are in the year?
365