📝 1st Grade Math: Addition And Subtraction Word Problems Study Notes
1st Grade Math: Addition and Subtraction Word Problems ➕➖
Word problems help us practice adding and subtracting numbers in real-life situations. We need to read carefully to understand what the problem is asking us to do: find a total (addition) or find how many are left/the difference (subtraction).
Understanding Word Problems
To solve a word problem, follow these steps:
- Read the problem carefully: What is happening?
- Identify the numbers: What numbers are given?
- Find the question: What do we need to find out?
- Choose the operation: Should we add or subtract?
- Solve the problem: Write an equation and find the answer.
- Write the answer: Make sure your answer makes sense.
Keywords to Look For
Certain words can give us clues about whether to add or subtract:
- Addition clues: "altogether," "in all," "total," "sum," "more than," "joined," "put together."
- Subtraction clues: "left," "take away," "difference," "how many more," "how many fewer," "lost," "gave away."
Addition Word Problems
When we add, we are combining groups to find a larger total.
Example: Sarah has 3 red apples. Her friend gives her 2 more green apples. How many apples does Sarah have altogether?
Thinking: We need to find the total number of apples. The word "altogether" tells us to add.
Equation: \(3 + 2 = 5\)
Answer: Sarah has 5 apples altogether.
Subtraction Word Problems
When we subtract, we are taking away a part from a whole, or finding the difference between two numbers.
Example: There were 7 birds on a tree. 4 birds flew away. How many birds are left on the tree?
Thinking: We need to find out how many birds remain. The words "flew away" and "left" tell us to subtract.
Equation: \(7 - 4 = 3\)
Answer: There are 3 birds left on the tree.
Practice Problems
Let's try a few!
| Problem | Operation | Equation | Answer |
|---|---|---|---|
| Tom has 5 toy cars. He gets 3 more for his birthday. How many toy cars does Tom have now? | Addition | \(5 + 3 = 8\) | 8 toy cars |
| Lisa had 9 cookies. She ate 2 of them. How many cookies does Lisa have left? | Subtraction | \(9 - 2 = 7\) | 7 cookies |
| There are 4 blue balloons and 5 yellow balloons. What is the total number of balloons? | Addition | \(4 + 5 = 9\) | 9 balloons |
| A farmer had 6 sheep. 3 sheep wandered off. How many sheep are still in the field? | Subtraction | \(6 - 3 = 3\) | 3 sheep |
📌 Key Takeaway: Always read word problems carefully to know if you need to add or subtract to find the answer.
💡 Pro Tip: Draw a picture to help you visualize the problem. For example, draw 3 circles and then 2 more circles to represent the apples in the first example.