Subtraction Story Problems within 10 - First Grade Mathematics

Real life is filled with subtraction stories: snacks being eaten, leaves falling from autumn trees, coins being spent, and toys being packed into boxes. A subtraction word problem describes a real-life situation where an amount is separated, lost, eaten, or compared. When you learn to spot the clues in a story, solving word problems becomes an enjoyable puzzle. In this chapter, you will master reading subtraction stories within 10, translating words into math pictures, and writing accurate subtraction equations.

Clue Words that Signal Subtraction

Just like a detective looks for footprints, a mathematician looks for clue words in story problems.

Common Subtraction Clue Words:
- "Left" or "Left over"       (How many are left?)
- "Ate" / "Gave away" / "Lost" (Action of removal)
- "Flew away" / "Ran away"     (Separation)
- "Fewer than"                (Comparison)
- "How many more...?"         (Difference)
- "Remain"                    (What stays behind)

Beware of Memorizing Only Keywords

While clue words are helpful clues, always read the entire story to understand what is actually happening. Ask yourself: "Did a group start with a whole and lose some items? Or are two groups being compared?"

Solving Take-From Story Problems

Let us practice solving a classic take-from subtraction story step by step.

The Story:
Hannah baked 9 strawberry tarts.
Her family ate 4 of the tarts after dinner.
How many tarts does Hannah have left?

Step 1: Understand the story.
        Starting whole = 9 tarts.
        Part eaten = 4 tarts.
        Question: How many are left?

Step 2: Draw a quick math sketch.
        (O) (O) (O) (O) (O)  [/] [/] [/] [/]
        5 tarts left uncrossed!

Step 3: Write the equation and answer.
        9 - 4 = 5
        Hannah has 5 tarts left!

Checking Your Answer with Addition

Every subtraction story can be checked using addition! Take the 5 tarts left over and add the 4 tarts that were eaten: 5 + 4 = 9 tarts! Because your parts add back up to the starting whole, you know your subtraction answer is 100% correct!

Solving Comparison Story Problems

Now let us practice a comparison story where nothing is taken away, but two amounts are compared.

The Story:
Oliver has 7 toy dinosaurs.
Lucas has 3 toy dinosaurs.
How many more dinosaurs does Oliver have than Lucas?

Math Model:
Oliver:  [D][D][D][D][D][D][D]  (7)
Lucas:   [D][D][D]              (3)
                   \_________/
                   Extra 4!

Equation: 7 - 3 = 4
Answer: Oliver has 4 more dinosaurs than Lucas!

Practice Exercises

Exercise 1: Read and solve: "There are 8 frogs resting on a log. 3 frogs jump into the pond. How many frogs are still resting on the log?" Write the subtraction equation and answer with a label.

Exercise 2: Read and solve: "Zoe has 10 stickers on her sticker sheet. She gives 6 stickers to her friend. How many stickers does Zoe have now?"

Exercise 3: Read and solve: "A basket holds 9 red apples and 5 green apples. How many more red apples are there than green apples?"

Exercise 4: Write your own subtraction story problem that matches the equation 6 - 2 = 4.

Solutions and Explanations

Solution to Exercise 1: Starting with 8 frogs, 3 frogs jump away: 8 - 3 = 5. There are 5 frogs still resting on the log.

Solution to Exercise 2: Zoe started with 10 stickers and gave 6 away: 10 - 6 = 4. Zoe has 4 stickers left now.

Solution to Exercise 3: This is a comparison story comparing 9 red apples to 5 green apples: 9 - 5 = 4. There are 4 more red apples than green apples.

Solution to Exercise 4: Example story: "Marcus had 6 toy cars in his garage. He took 2 cars out to play on the rug. How many cars remained inside the garage?" (Equation: 6 - 2 = 4).