Problem 1:
114 birds were sitting in a tree. 21 more birds flew up to the tree. How many birds were there altogether in the tree?
#### Solution:
To solve this problem, we need to add the number of birds initially in the tree to the number of birds that flew up later.
- Initial number of birds: 114
- Birds that flew up: 21
Now, perform the addition:
\[
114 + 21 = 135
\]
#### Final Answer:
\[
\boxed{135}
\]
---
Problem 2:
29 birds were sitting in a tree. Some more fly up to the tree. Then there were 142 birds in the tree. How many more flew up to the tree?
#### Solution:
We know the initial number of birds and the total number of birds after some more flew up. To find how many more birds flew up, we subtract the initial number of birds from the total number of birds.
- Initial number of birds: 29
- Total number of birds after more flew up: 142
Now, perform the subtraction:
\[
142 - 29 = 113
\]
#### Final Answer:
\[
\boxed{113}
\]
---
Problem 3:
Beth has 74 crayons. She gives 25 of them away to Jen. How many crayons does Beth have left?
#### Solution:
To find out how many crayons Beth has left, we subtract the number of crayons she gave away from the total number of crayons she initially had.
- Initial number of crayons: 74
- Crayons given away: 25
Now, perform the subtraction:
\[
74 - 25 = 49
\]
#### Final Answer:
\[
\boxed{49}
\]
---
Summary of Answers:
1. \(\boxed{135}\)
2. \(\boxed{113}\)
3. \(\boxed{49}\)
Parent Tip: Review the logic above to help your child master the concept of 2nd grade math problems solving worksheet.