Estimate tips
key notes :
📌 What is a Tip?
- A tip is extra money given to service workers (like waiters or delivery persons).
- It shows appreciation for good service 😊.
📌 Why Do We Estimate Tips?
- To quickly decide how much to tip.
- Useful when doing mental math without a calculator.
- Helps avoid under-tipping or over-tipping.
📌 Common Tip Percentages
- 10% – okay service
- 15% – good service
- 20% – excellent service ⭐
📌 Rounding the Bill Amount
- Round the bill to the nearest ten or whole number to make calculation easier.
- Example: ₹287 ≈ ₹290 or ₹300
📌 Estimating 10% Tip
Move the decimal one place to the left.
Example:
- Bill = ₹350
- 10% tip ≈ ₹35
📌 Estimating 20% Tip
First find 10%, then double it.
Example:
- Bill = ₹350
- 10% ≈ ₹35
- 20% ≈ ₹70
📌 Estimating 15% Tip
- Find 10% + half of 10%.
- Example:
- Bill = ₹200
- 10% = ₹20
- 5% = ₹10
- 15% = ₹30
📌 Checking Reasonableness
- Ask yourself:
Does the tip seem fair compared to the bill amount? - Estimation is about being close, not exact ✔️
📌 Real-Life Application
- Used in restaurants, hotels, taxis, food delivery 🚕🍽️
- Helps in budgeting and financial awareness.
📌 Key Vocabulary
- Estimate – a close guess
- Percentage (%) – a part out of 100
- Rounding – making numbers simpler
Learn with example
Estimate the amount of the tip by rounding the bill to the nearest rupee before calculating.
15% tip on a bill of ₹55.35
The amount of the tip is approximately ₹.——-.
Round ₹55.35 to the nearest rupee.
₹55.35 → ₹55
Find 10% of ₹55.
1/10× ₹55=₹5.50
Now add an extra half of that result. That will give you 15% of ₹55.
₹5.50+1/2× ₹5.50=₹5.50+₹2.75=₹8.25
15% tip on a bill of ₹55.35 is approximately ₹8.25.
Compare your estimate to the exact answer:
Estimate: 15% of ₹55.35≈ 15% of ₹55 = ₹8.25
Exact answer:15% of ₹55.35 = ₹8.3025 → ₹8.30
Estimate the amount of the tip by rounding the bill to the nearest rupee before calculating.
15% tip on a bill of ₹46.05
The amount of the tip is approximately ₹——-.
Round ₹46.05 to the nearest rupee.
₹46.05 → ₹46
Find 10% of ₹46.
1/10× ₹46=₹4.60
Now add an extra half of that result. That will give you 15% of ₹46.
₹4.60+1/2× ₹4.60=₹4.60+₹2.30=₹6.90
15% tip on a bill of ₹46.05 is approximately ₹6.90.
Compare your estimate to the exact answer:
Estimate: 15% of ₹46.05 ≈ 15% of ₹46 = ₹6.90
Exact answer: 15% of ₹46.05 = ₹6.9075 → ₹6.91
Estimate the amount of the tip by rounding the bill to the nearest rupee before calculating.
15% tip on a bill of ₹39.22
The amount of the tip is approximately ₹——-.
Round ₹39.22 to the nearest rupee.
₹39.22 → ₹39
Find 10% of ₹39.
1/10× ₹39=₹3.90
Now add an extra half of that result. That will give you 15% of ₹39.
₹3.90+1/2× ₹3.90=₹3.90+₹1.95=₹5.85
15% tip on a bill of ₹39.22 is approximately ₹5.85.
Compare your estimate to the exact answer:
Estimate: 15% of ₹39.22 ≈ 15% of ₹39 = ₹5.85
Exact answer: 15% of ₹39.22 = ₹5.883 → ₹5.88
let’s practice!
