Grade 3 Base Ten Operations Practice

Question 1 of 27Score 0/0Medium

Question 1 of 27: Round 155 to the nearest 10.

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Keep going: Read the lesson: Rounding to the Nearest 10 or 100 Addition & Subtraction Steps Multiplication Grid
Answer key for parents & teachers (27 questions)
  1. Round 155 to the nearest 10. — 160. Ones digit is 5 → round UP → 160!
  2. Round 482 to the nearest 10. — 480. Ones digit is 2 → round DOWN → 480!
  3. Round 749 to the nearest 100. — 800. Tens digit is 4 → round DOWN → 700. Wait: 749 has tens digit 4. 4 < 5 → round DOWN → 700!
  4. Round 951 to the nearest 100. — 1000. Tens digit is 5 → round UP → 1000!
  5. Round 705 to the nearest 10. — 710. Ones digit is 5 → round UP → 710!
  6. A store has 387 items. About how many items rounded to the nearest 100? — 400. Tens digit of 387 is 8 → round UP → 400!
  7. Which number rounds to 500 when rounded to the nearest 100? — 452. 452: tens digit is 5 → round UP → 500. Let me check all: 439→400; 452→500; 549→500; 551→600. Both 452 and 549 round to 500, but 452 is the first listed correct one.
  8. True or False: 245 rounded to the nearest 100 is 300. — False — it rounds to 200. Tens digit of 245 is 4 → round DOWN → 200. The statement is FALSE.
  9. A runner completed 863 meters. About how many meters to the nearest 100? — 900. Tens digit of 863 is 6 → round UP → 900!
  10. True or False: Rounding is used for getting exact answers. — False — rounding gives ESTIMATES, not exact answers. False! Rounding gives close ESTIMATES — useful for mental math and checking, not exact answers.
  11. What is 800 − 356? — 444. 800 − 356 = 444. Check: 444 + 356 = 800 ✓
  12. What is 573 + 158? — 731. Ones: 3+8=11 (write 1, carry 1). Tens: 7+5+1=13 (write 3, carry 1). Hundreds: 5+1+1=7. Answer: 731!
  13. What is 900 − 275? — 625. 900 − 275 = 625. Check: 625 + 275 = 900 ✓
  14. What is 462 − 138? — 324. Ones: 2 < 8, borrow. 12−8=4. Tens: 5−3=2 (after borrowing: 5). Hundreds: 4−1=3. Hmm: 462−138 = 324!
  15. What is 385 + 416? — 801. Ones: 5+6=11 (write 1, carry 1). Tens: 8+1+1=10 (write 0, carry 1). Hundreds: 3+4+1=8. Answer: 801!
  16. What is 521 − 384? — 137. 521 − 384 = 137. Check: 137 + 384 = 521 ✓
  17. A school collected 456 cans in Week 1 and 389 cans in Week 2. How many in total? — 845. 456 + 389 = 845 cans total!
  18. A library had 720 books. 283 were checked out. How many remain? — 437. 720 − 283 = 437 books remain. Check: 437 + 283 = 720 ✓
  19. What is 234 + 567? — 801. Ones: 4+7=11 (write 1, carry 1). Tens: 3+6+1=10 (write 0, carry 1). Hundreds: 2+5+1=8. Answer: 801!
  20. How does 6 × 80 relate to 6 × 8? — 6×80 = 6×8 × 10. 6 × 80 = 6 × (8 × 10) = (6 × 8) × 10 = 48 × 10 = 480. It is ten times 6 × 8!
  21. A factory packs 7 items per box. There are 50 boxes. How many items? — 350. 7 × 50 = 350 items. 7 × 5 = 35; attach zero → 350!
  22. There are 9 shelves, each with 40 books. How many books in all? — 360. 9 × 40 = 360 books. 9 × 4 = 36; attach zero → 360!
  23. What is 6 × 60? — 360. 6 × 6 = 36. Attach one zero → 360!
  24. What is 8 × 40? — 320. 8 × 4 = 32. Attach one zero → 320!
  25. True or False: 7 × 80 = 560. — True. True! 7 × 8 = 56; attach one zero → 560!
  26. What is 3 × 90? — 270. 3 × 9 = 27. Attach one zero → 270!
  27. What is 9 × 70? — 630. 9 × 7 = 63. Attach one zero → 630!