Pit Stop Budget Worksheet
Grade 4 Math Lab Consumer Math & Rates
Pit Stop Budget Worksheet
Name:
Date:
Crew / Class:
The Cruiser Repair Mission
Your pit crew is fixing up the Speedy Cruiser. You have a budget of $100.00. Shop across three auto supply stores, calculate the unit rate (price for 1 item), and circle the best value for each repair part!
Unit Rate Formula
Total Price ÷ Quantity = Cost for 1
Example: $8 for 4 caps = $2 each
1
Part 1: Spark Plugs
Need: 4 Spark Plugs
Calculate the cost of 1 spark plug at each supply shop. Show your division work:
Gearhead Depot
Package Deal: $12 for 2 plugs
Work Area ($12 ÷ 2):
Unit Rate: $ _____ / plug
Speedy Auto
Package Deal: $20 for 4 plugs
Work Area ($20 ÷ 4):
Unit Rate: $ _____ / plug
Apex Parts
Package Deal: $21 for 3 plugs
Work Area ($21 ÷ 3):
Unit Rate: $ _____ / plug
Best Value Shop:
Cost for 4 plugs at this rate: $ _____
2
Part 2: Motor Oil (Quart Bottles)
Need: 4 Quarts of Oil
Find which auto supply store sells 1 quart of motor oil for the lowest price:
Gearhead Depot
Package Deal: $28 for 4 quarts
Work Area ($28 ÷ 4):
Unit Rate: $ _____ / quart
Speedy Auto
Package Deal: $16 for 2 quarts
Work Area ($16 ÷ 2):
Unit Rate: $ _____ / quart
Apex Parts
Package Deal: $18 for 3 quarts
Work Area ($18 ÷ 3):
Unit Rate: $ _____ / quart
Best Value Shop:
Cost for 4 quarts at this rate: $ _____
Speedy Cruiser Repair Project • 4th Grade Math Turn to Page 2 to shop Wiper Blades & Headlights → Page 1 of 4
Pit Stop Parts & Budget Ledger
Complete the last two parts, record your best buys, and check your $100 budget.
Total Pit Budget: $100.00
3
Part 3: Wiper Blades
Need: 2 Blades
Gearhead Depot: $18 for 2 blades
Work: $18 ÷ 2 Rate: $ _____ / blade
Speedy Auto: $12 for 1 blade
Work: $12 ÷ 1 Rate: $ _____ / blade
Apex Parts: $30 for 3 blades
Work: $30 ÷ 3 Rate: $ _____ / blade
Best Shop: ____________ Cost for 2: $ _____
4
Part 4: Headlight Bulbs
Need: 2 Bulbs
Gearhead Depot: $36 for 3 bulbs
Work: $36 ÷ 3 Rate: $ _____ / bulb
Speedy Auto: $16 for 2 bulbs
Work: $16 ÷ 2 Rate: $ _____ / bulb
Apex Parts: $11 for 1 bulb
Work: $11 ÷ 1 Rate: $ _____ / bulb
Best Shop: ____________ Cost for 2: $ _____
The Pit Crew Shopping & Budget Ledger
Fill in your best value picks below
| Car Part | Best Shop Chosen | Qty Needed | Unit Price | Total Cost |
|---|
| Spark Plugs | ___________________ | 4 | $ _____ | $ _____ |
| Motor Oil | ___________________ | 4 quarts | $ _____ | $ _____ |
| Wiper Blades | ___________________ | 2 | $ _____ | $ _____ |
| Headlight Bulbs | ___________________ | 2 | $ _____ | $ _____ |
| Total Repair Cost (Add all 4 parts): | $ _______ | | | |
| Remaining Money ($100.00 Starting Budget − Total Cost): | $ _______ | | | |
Pit Crew Math Analysis
1. Look at the spark plugs. How much money did you save on each plug by buying from Speedy Auto ($5 each) instead of Apex Parts ($7 each)?
Difference: $ _____ − $ _____ = Saved $ _____ per spark plug
2. Smart Shopper Check: A rookie mechanic says: "Apex Parts sells 1 headlight bulb for $11. Since $11 is smaller than $16, Apex is a cheaper deal than Speedy Auto ($16 for 2)!" Is the rookie correct? Explain why:
Speedy Cruiser Repair Project • Budget balanced! Turn to Page 3 for Advanced Upgrades → Page 2 of 4
Classwork Part 2 Upgrades & Deal Busters
Cruiser Performance Upgrades
Extra Parts Needed Filters & Brakes
Mission Update: The head mechanic noticed the Cruiser also needs new Air Filters and Brake Pad Sets. Compute the unit rates to help the crew choose the best bargains!
5
Part 5: Engine Air Filters
Need: 2 Air Filters
Gearhead Depot
Deal: $28 for 2 filters
Work: $28 ÷ 2
Rate: $ _____ / filter
Speedy Auto
Deal: $36 for 3 filters
Work: $36 ÷ 3
Rate: $ _____ / filter
Apex Parts
Deal: $15 for 1 filter
Work: $15 ÷ 1
Rate: $ _____ / filter
Best Value Store: ____________________ Cost for 2 Filters: $ _____
6
Part 6: Brake Pad Sets
Need: 2 Brake Sets
Gearhead Depot
Deal: $44 for 2 sets
Work: $44 ÷ 2
Rate: $ _____ / set
Speedy Auto
Deal: $25 for 1 set
Work: $25 ÷ 1
Rate: $ _____ / set
Apex Parts
Deal: $60 for 3 sets
Work: $60 ÷ 3
Rate: $ _____ / set
Best Value Store: ____________________ Cost for 2 Sets: $ _____
Deal Detective Word Problems
Challenge A: Battery Cables. Gearhead Depot sells a 2-pack of battery cables for $18. Apex Parts sells 1 single cable for $10. Your car needs 2 cables.
Cost to buy 2 single cables at Apex: 2 × $10 = $ _____ Money saved with the 2-pack: $ _____
Challenge B: Mechanic Socket Wrenches. Speedy Auto offers a box of 5 wrenches for $35. Apex Parts offers a box of 4 wrenches for $32.
Speedy Auto Rate ($35 ÷ 5): $ _____ per wrench
Apex Parts Rate ($32 ÷ 4): $ _____ per wrench
Which shop has the lower unit price per wrench? ____________________
Speedy Cruiser Repair Project • Unit Rate Investigations Turn to Page 4 for the Receipt Audit Challenge → Page 3 of 4
Audit Activity Error Detection & Applied Math
The Garage Receipt Audit
Check The Clerk's Math!
Gearhead Depot #104
Auto Parts Sales Receipt
4 Spark Plugs @ $6 $24.00
2 Wiper Blades @ $9 $18.00
3 Coolant Jugs @ $8 $30.00
TOTAL BILLED: $72.00
Thank you for shopping local!
Audit Instructions:
A trainee clerk printed this receipt for your crew. One item was multiplied incorrectly, causing the total to be wrong! Use your math skills to catch the mistake.
1. Which item on the receipt has the wrong total cost?
Incorrect Item: _____________________________________
2. What should the correct cost be?
Math: 3 coolant jugs × $8 each = $ _______
3. How much did the clerk overcharge your crew?
Difference: $30.00 − $ _______ = $ _______ refund
Pit Crew Fundraiser Challenge
To raise money for the Junior Soapbox Derby, your pit crew builds Tune-Up Kits to sell to local drivers. Each kit contains 3 Spark Plugs and 1 Quart of Motor Oil.
Step 1: Cost to Build 1 Kit
• 3 Spark Plugs ($5 each): 3 × $5 = $ _____
• 1 Quart Motor Oil: $ _____
Total crew cost to make 1 kit: $ _____
Step 2: Calculating Profit
• Selling Price: $30.00 per kit
• Total Kit Cost: $ _____
Profit per kit ($30 − cost): $ _____
Smart Shopper Reflection
Why should a smart shopper calculate the unit rate (price for 1 item) instead of just buying the box that has the lowest total price tag? Explain your thinking:
Speedy Cruiser Repair Project • Fantastic work finishing all 4 pages! Page 4 of 4
