Let's solve each word problem step by step.
---
Problem 1:
There are 50 roses in the garden. If 18 of them are red and 12 are white, how many roses are of other colors?
#### Solution:
1. Total number of roses = 50
2. Number of red roses = 18
3. Number of white roses = 12
To find the number of roses of other colors:
- Subtract the number of red and white roses from the total number of roses.
\[ \text{Roses of other colors} = \text{Total roses} - (\text{Red roses} + \text{White roses}) \]
\[ \text{Roses of other colors} = 50 - (18 + 12) \]
\[ \text{Roses of other colors} = 50 - 30 \]
\[ \text{Roses of other colors} = 20 \]
#### Answer:
\[ \boxed{20} \]
---
Problem 2:
Ella bought a box of colored markers that contains 30 markers. She gave 8 markers to her sister. How many markers does Ella have now?
#### Solution:
1. Total number of markers Ella initially had = 30
2. Number of markers Ella gave to her sister = 8
To find the number of markers Ella has now:
- Subtract the number of markers given away from the total number of markers.
\[ \text{Markers Ella has now} = \text{Total markers} - \text{Markers given away} \]
\[ \text{Markers Ella has now} = 30 - 8 \]
\[ \text{Markers Ella has now} = 22 \]
#### Answer:
\[ \boxed{22} \]
---
Problem 3:
There are 36 books on a shelf, and 24 of them are fiction books. How many books are non-fiction?
#### Solution:
1. Total number of books = 36
2. Number of fiction books = 24
To find the number of non-fiction books:
- Subtract the number of fiction books from the total number of books.
\[ \text{Non-fiction books} = \text{Total books} - \text{Fiction books} \]
\[ \text{Non-fiction books} = 36 - 24 \]
\[ \text{Non-fiction books} = 12 \]
#### Answer:
\[ \boxed{12} \]
---
Problem 4:
Rob wants to buy a toy that costs $15. He already has $8. How much more money does he need to buy the toy?
#### Solution:
1. Cost of the toy = $15
2. Money Rob already has = $8
To find how much more money Rob needs:
- Subtract the amount of money Rob has from the cost of the toy.
\[ \text{Money needed} = \text{Cost of the toy} - \text{Money Rob has} \]
\[ \text{Money needed} = 15 - 8 \]
\[ \text{Money needed} = 7 \]
#### Answer:
\[ \boxed{7} \]
---
Final Answers:
1. \( \boxed{20} \)
2. \( \boxed{22} \)
3. \( \boxed{12} \)
4. \( \boxed{7} \)
Parent Tip: Review the logic above to help your child master the concept of worksheet on addition word problems for grade 2.