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Decimal Operations Challenge
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Decimal Operations Challenge
📚 Part 1: Multiple Choice
1. In the number 3.279, what is the value of the digit 7?
7
0.7
0.07
0.007
2. Which decimal is the smallest?
4.12
4.2
4.102
4.021
3. Round 5.746 to the nearest tenth.
5.7
5.8
5.75
5.70
4. A pair of socks costs $4.75. What is the total cost for 3 pairs?
$12.25
$14.25
$13.75
$15.25
✏️ Part 2: Short Answers & Calculations
5. Calculate: 4.52 + 3.74 = ________
6. Subtract and round to two decimal places: 10.00 − 7.385 = ________
7. Multiply: 2.3 × 4 = ________
8. Divide: 5.6 ÷ 2 = ________
9. Word problem — A cyclist rides 12.35 km, then 5.6 km, then a detour adds 0.425 km. What is the total distance? Round your answer to the nearest hundredth (km).
🔍 Part 3: Estimation & Reasonableness
10. Use rounding to estimate and check reasonableness:
Round 4.58 and 3.92 to the nearest whole number, then estimate (rounded) : (rounded 4.58 + rounded 3.92) × 2 = ________
Now calculate the exact value: (4.58 + 3.92) × 2 = ________
Is your estimate an overestimate or an underestimate of the exact value? Explain briefly (one sentence).
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