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Decimal Estimation Practice

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Decimal Estimation Practice worksheet preview
Decimal Estimation Practice

Decimal Estimation Practice

Decimal estimation illustration

🔢 Part 1: Rounding Decimals

1. Round these decimals to the nearest whole number:

a) 4.27 = ______

b) 6.77 = ______

c) 8.05 = ______

d) 9.51 = ______

2. Round these decimals to the nearest tenth:

a) 3.46 = ______

b) 7.83 = ______

c) 2.15 = ______

d) 5.94 = ______

3. Circle the correct rounded answer:

What is 12.68 rounded to the nearest whole number?

12

13

12.7

10

💰 Part 2: Shopping Estimation

4. Estimate the total cost by rounding each price to the nearest dollar first:

Milk: $4.35 → $______

Bread: $2.89 → $______

Apples: $3.67 → $______

Estimated total: $______

5. Sarah has $20.00. She wants to buy items costing $6.45, $7.89, and $4.23. Estimate if she has enough money:
6. Which estimation strategy would you use? Check all that apply:

Round to the nearest dollar

Round to the nearest 50 cents

Use the benchmark 0.5

Add the exact amounts

📏 Part 3: Distance and Measurement

7. Estimate the total distance by rounding to the nearest kilometre:

From home to school: 2.7 km → ______ km

From school to library: 1.4 km → ______ km

From library to park: 3.8 km → ______ km

Estimated total distance: ______ km

8. The temperature was 18.6°C in the morning and rose by 4.3°C by afternoon. Estimate the afternoon temperature:
9. Circle the best estimate for 15.23 - 7.81:

About 7

About 8

About 9

About 10

🧠 Part 4: Problem Solving

10. Jake ran 3.45 km on Monday, 2.78 km on Tuesday, and 4.12 km on Wednesday. Estimate his total distance for the three days:
11. Fill in the blanks using estimation vocabulary:

When we estimate 6.89 + 3.21, we can say the answer is __________ 10. This is __________ than the exact answer but __________ enough for checking our work.

12. Match the decimal with its best rounded estimate:
1. 7.23 + 4.67
2. 9.81 - 3.19
3. 5.45 + 2.38
4. 8.92 - 4.07
A. About 5
B. About 7
C. About 8
D. About 12

✨ Part 5: Extension Challenge

13. Advanced estimation: A recipe needs 2.75 cups of flour, 1.33 cups of sugar, and 0.67 cups of butter. Estimate the total amount of ingredients:
14. Explain your reasoning: Why is estimation useful in everyday life? Give two examples:
15. True or False: An estimate should always be exactly the same as the actual answer.

True

False

Explain your answer: _________________________________

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