Grade 5 Base Ten Operations Practice — Easy

Question 1 of 27Score 0/0Easy

Question 1 of 27: How many decimal places are in the thousandths position?

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Keep going: Read the lesson: Decimal Place Value to Thousandths Place Value Explorer Multiplication Grid
Answer key for parents & teachers (27 questions)
  1. How many decimal places are in the thousandths position? — 3. Thousandths is the 3rd place to the right of the decimal point.
  2. What is the value of the digit 5 in 2.543? — 5 tenths. In 2.543: the first digit after the decimal is in the tenths place, so 5 = 5 tenths = 0.5.
  3. How do you read the decimal point aloud? — "And". The decimal point is read as "and." For example, 3.5 is "three and five tenths."
  4. Which number is greatest: 0.45, 0.054, 0.405, 0.450? — 0.45 and 0.450 are tied for greatest. 0.45 = 0.450 (trailing zeros don't change value). 0.405 < 0.45. So 0.45 and 0.450 are equal and greatest.
  5. What is 321.456 expanded? (tenths place only) — 300 + 20 + 1 + 4/10 + 5/100 + 6/1000. 321.456 = 300 + 20 + 1 + 4/10 + 5/100 + 6/1000 in full expanded form.
  6. What digit is in the hundredths place in 5.289? — 8. In 5.289: tenths=2, hundredths=8, thousandths=9. The hundredths digit is 8.
  7. Is 0.400 equal to 0.4? — Yes, trailing zeros do not change value. Trailing zeros after the last significant digit do not change a decimal's value. 0.400 = 0.40 = 0.4.
  8. What is 10² equal to? — 100. 10² = 10 × 10 = 100.
  9. What is 10Âŗ equal to? — 1,000. 10Âŗ = 10 × 10 × 10 = 1,000.
  10. When you multiply a number by 10, what happens to each digit? — Each digit shifts one place to the left. Multiplying by 10 shifts all digits one place to the LEFT (the value grows 10 times).
  11. What is 4.7 × 10? — 47. Multiply by 10š: shift 1 place left. 4.7 → 47.
  12. What is 4.7 × 100? — 470. Multiply by 10²: shift 2 places left. 4.7 → 47 → 470.
  13. What is 365 Ãˇ 10? — 36.5. Divide by 10š: shift 1 place right. 365 → 36.5.
  14. What is 365 Ãˇ 1,000? — 0.365. 1,000 = 10Âŗ: shift 3 places right. 365 → 36.5 → 3.65 → 0.365.
  15. Multiplying by a power of 10 makes the number: — Bigger (digits shift left). Multiplying by any power of 10 greater than 1 makes the number bigger — digits shift left.
  16. What is the first step in the standard multiplication algorithm for 342 × 27? — Multiply 342 by the ones digit (7). Always start with the ones digit. Multiply 342 × 7 = 2,394 first.
  17. What is 342 × 7? — 2,394. 342 × 7: 2×7=14 (write 4, carry 1), 4×7=28+1=29 (write 9, carry 2), 3×7=21+2=23. Answer: 2,394.
  18. What is 214 × 6? — 1,284. 4×6=24 (write 4, carry 2), 1×6=6+2=8, 2×6=12. Answer: 1,284.
  19. What is 214 × 30? — 6,420. 214 × 3 = 642, then multiply by 10 (add 0): 6,420.
  20. What is a good estimate for 342 × 27? — 9,000. Round: 300 × 30 = 9,000. This is close to the exact answer of 9,234.
  21. What is the purpose of estimating before computing a multiplication problem? — To check if the answer is reasonable. Estimating helps you verify that your computed answer is in the right ballpark — catching major errors.
  22. What is 100 × 73? — 7,300. Multiply by 100: shift 2 places left. 73 × 100 = 7,300.
  23. What is the most important rule when adding or subtracting decimals? — Line up the decimal points. When adding or subtracting decimals, always align (line up) the decimal points so place values match up correctly.
  24. What is 3.4 + 2.15? — 5.55. Line up decimals: 3.40 + 2.15 = 5.55.
  25. What is 3.4 × 2.5? — 8.5. 34 × 25 = 850. Total decimal places: 1+1=2. Answer: 8.50 = 8.5.
  26. What is a quick estimate for 3.4 × 2.5? — ~9 (about 3 × 3). 3.4 ≈ 3, 2.5 ≈ 3. Estimate: 3 × 3 = 9. Actual answer 8.5 is close.
  27. What is 9.6 Ãˇ 3? — 3.2. 96 Ãˇ 3 = 32. One decimal place: 3.2.