Financial Literacy Grade 4: Income Expenses and Saving

Grade 4 Financial Literacy Study Guide: Income, Expenses, and Saving

1. The Driving Question

"If you get $10 every week for doing chores, but you really want a $50 video game—why can’t you just buy it right away? And if you do save up, how do you know when you’ll have enough, or if you’re accidentally spending money on things you don’t even notice?" This isn’t just about "not spending all your money"—it’s about figuring out how money moves in and out of your life on purpose, so you’re in control of it instead of it controlling you.

2. The Core Idea — Built, Not Listed

Imagine your money is like water in a bathtub. The faucet is your income—money flowing in (like your $10 weekly chore money or birthday cash). The drain is your expenses—money flowing out (like buying a $2 pack of gum or paying $5 for a school field trip). If you leave the drain open, the water (your money) disappears, and you can’t fill the tub enough to buy that $50 video game. Saving is like plugging the drain and letting the water build up over time.

But here’s the trick: not all expenses are obvious. Some are fixed (like a $3 weekly subscription to a game you have to pay for), and some are variable (like buying an extra snack when you’re hungry). If you don’t track them, you might think you have more money than you do—and then the bathtub suddenly empties.

Key Vocabulary: - Income: Money you receive, like allowance, gifts, or payment for work. Example: Your neighbor pays you $5 to walk their dog every Saturday. (Note: In high school, you’ll learn about "gross vs. net income"—how taxes and deductions change what you actually take home.)

• Expenses: Money you spend on things you need or want. Example: Your little brother "borrows" $1 from you every day for a week to buy candy, and you don’t get it back. That’s $7 in expenses you didn’t plan for!

• Fixed Expense: A cost that stays the same every time. Example: Your family pays $20 every month for a streaming service—it’s the same amount, no matter how much you use it.

• Variable Expense: A cost that changes depending on how much you use it. Example: You buy a $1 lemonade from the stand on your street. Some days you buy one, some days you buy two, and some days you skip it.

• Saving: Setting aside money now so you can spend it on something bigger later. Example: Instead of buying a $3 toy every week, you save that money for 5 weeks to buy a $15 action figure.

3. Assessment Translation (Grade 4 Classroom Focus)

How this appears in class: - Exit Tickets: Short questions like "You earn $8 this week. Your fixed expense is $3 for a school lunch. Your variable expense is $2 for a snack. How much can you save?" - Show-Your-Work Problems: A table where you list income and expenses for a month and calculate the total. - Short Constructed Response: "Explain why it’s harder to save money if you have a lot of variable expenses."

Proficient vs. Developing Responses: | Proficient | Developing | |----------------|----------------| | "I earned $10 and spent $4 on a fixed expense (my bus pass) and $3 on a variable expense (a comic book). I saved $3 because $10 - $4 - $3 = $3." | "I saved $3 because I didn’t spend all my money." (Doesn’t show calculations or distinguish between expense types.) | | "Variable expenses are harder to plan for because they change. Like, I might not know I’ll want a snack until I’m hungry." | "Variable expenses are when you spend money." (No explanation of why they’re different from fixed expenses.) |

Model Proficient Response: "If I get $12 every week and my fixed expenses are $5 for my phone game subscription, I know I’ll always have $7 left. But if I spend $2 on a variable expense like a slushie, I’ll have $5 left. If I save that $5 every week, in 4 weeks I’ll have $20 to buy a new book. But if I spend $3 on a toy one week, I’ll only have $2 left, and it’ll take me 5 weeks to save $20 instead of 4."

What the teacher looks for: - Correct calculations (addition/subtraction). - Labels for income, fixed expenses, variable expenses, and savings. - Explanations that show why certain expenses are harder to plan for.

4. Mistake Taxonomy

Mistake 1: Forgetting to Subtract Fixed Expenses First Prompt: "You earn $15 this week. Your fixed expense is $6 for a music app. Your variable expense is $4 for a movie ticket. How much can you save?" Common Wrong Answer: "I can save $11 because $15 - $4 = $11." (Student only subtracted the variable expense.) Why It Loses Credit: The student ignored the fixed expense, so their answer is wrong. Fixed expenses always come out first—they’re non-negotiable. Correct Approach:
1. Start with income: $15.
2. Subtract fixed expense first: $15 - $6 = $9.
3. Subtract variable expense: $9 - $4 = $5.
4. What’s left is savings: $5.

Mistake 2: Mixing Up Fixed and Variable Expenses Prompt: "Which of these is a fixed expense? A) Buying a new video game B) Paying $5 every month for a streaming service C) Getting a $3 ice cream D) Buying a $10 birthday gift for a friend" Common Wrong Answer: "A) Buying a new video game." (Student thinks "expensive" = fixed.) Why It Loses Credit: Fixed expenses are the same amount every time, not just things that cost a lot. A video game is a one-time purchase (variable). Correct Approach: - Fixed expenses repeat at the same cost (like the $5 streaming service). - Variable expenses change (like ice cream or gifts).

Mistake 3: Not Planning for "Invisible" Expenses Prompt: "You want to save $20 for a new toy. You earn $10 a week. How many weeks will it take if you have no expenses? How many weeks if you spend $2 every week on snacks?" Common Wrong Answer: "It takes 2 weeks because $10 x 2 = $20." (Student ignores the snack expense.) Why It Loses Credit: The student didn’t account for the variable expense, so their answer is unrealistic. Correct Approach:
1. No expenses: $10 x 2 weeks = $20.
2. With $2 snacks: $10 - $2 = $8 saved per week.
3. $20 ÷ $8 = 2.5 weeks-3 weeks (you can’t have half a week!).

5. Connection Layer

1. Within Financial Literacy-Budgeting: Income, expenses, and saving are the building blocks of a budget. Once you understand how money flows in and out, you can plan ahead for big goals (like that $50 video game) instead of wondering where your money went.

2. Across Subjects-Math (Multiplication/Division): Saving is just repeated addition (e.g., $5 saved every week for 4 weeks = $5 x 4 = $20). But if you have expenses, it’s like division with remainders—you have to figure out how many full weeks you need to reach your goal.

3. Outside School-Grocery Store Sales: Ever see a sign that says "Buy 2, Get 1 Free"? That’s a store using fixed vs. variable expenses to trick you. The "free" item is a variable expense (you don’t have to buy it), but the store hopes you’ll spend more than you planned.

6. The Stretch Question

"If you get $10 a week and your friend gets $5 a week, but they have no expenses and you have $3 in fixed expenses every week—who will save more money after 4 weeks? What if your friend gets a $2 raise, but you get a $1 raise and your fixed expenses go up by $1?"

Pointer Toward the Answer: Start by calculating each person’s savings per week: - You: $10 - $3 = $7 saved per week. - Friend: $5 - $0 = $5 saved per week. After 4 weeks, you’ll have $28, and they’ll have $20—so you’re ahead. But if your friend gets a $2 raise, they’ll save $7 per week ($5 + $2), while you’ll save $7 ($10 + $1 - $4 in fixed expenses). Now it’s a tie! The key is to see how changes in income and expenses shift the balance over time. Try plugging in different numbers to see what happens.