Add and Subtract Within 1000 - 3rd Grade Math

1. What is the value of the digit $7$ in the number $472$?

   $70$. The digit 7 is in the tens place, representing 7 tens.

2. What is $348 + 199$?

   $547$. Add 199 by adding 200, then subtracting 1: $348+200-1=547$.

3. What number makes the equation true: $x + 275 = 900$?

   $625$. To find $x$, subtract $275$ from $900$: $900-275=625$.

4. What is $405 + 295$?

   $700$. Add with regrouping: $5+5=10$ (carry 1), total equals 700.

5. What is $650 - 398$?

   $252$. Subtract 398 by subtracting 400, then adding 2: $650-400+2=252$.

6. What is $300 + 40 + 6$ written as a standard number?

   $346$. Combine place values: 3 hundreds, 4 tens, and 6 ones.

7. What is $450 + 30$?

   $480$. Add $3$ tens to $450$: $450 + 30 = 480$.

8. What is $376 + 125$?

   $501$. Add ones, tens, hundreds with regrouping: $6+5=11$, carry 1.

9. What is $387 + 6$?

   $393$. Add $6$ ones to $387$: $7 + 6 = 13$, carry the $1$.

10. What place value is the digit $7$ in the number $472$?

    Tens place. The second digit from the right represents tens.

11. What is $999 - 450$?

    $549$. No regrouping needed: subtract each place value directly.

12. What is $389 + 211$?

    $600$. Add ones: $9+1=10$ (carry 1), tens: $8+1+1=10$ (carry 1), hundreds: $3+2+1=6$.

13. What is $800 - 465$?

    $335$. Subtract with regrouping: borrow from 8 hundreds.

14. What is $600 + 90 + 8 + 200 + 30 + 4$?

    $924$. Group by place value: $(600+200) + (90+30) + (8+4) = 924$.

15. What number makes the equation true: $639 - x = 400$?

    $239$. To find $x$, subtract $400$ from $639$: $639-400=239$.

16. What is $701 - 289$?

    $412$. Subtract with regrouping from 701: borrow across zeros.

17. What is $730 - 300$?

    $430$. Subtract 3 hundreds from 7 hundreds, keeping 30.

18. What is $810 - 395$?

    $415$. Regroup from tens: $810=8$ hundreds $0$ tens $10$ ones, then subtract.

19. What is $430 + 270$?

    $700$. Add ones: $0+0=0$, tens: $3+7=10$ (carry 1), hundreds: $4+2+1=7$.

20. What is $246 + 378$?

    $624$. Add with regrouping: $6+8=14$ (carry 1), $4+7+1=12$ (carry 1), $2+3+1=6$.

21. Identify the missing number: $\square - 275 = 400$.

    $675$. Find what minus 275 equals 400: $400+275=675$.

22. What is $345 + 120$?

    $465$. Add by place value: $300 + 100 = 400$, $40 + 20 = 60$, $5 + 0 = 5$.

23. What is $630 - 20$?

    $610$. Subtract tens: $30 - 20 = 10$, keep $600$ unchanged.

24. What is the related subtraction fact for $348 + 200 = 548$?

    $548 - 200 = 348$. Addition and subtraction are inverse operations; swap sum and addend.

25. What is $501 - 267$?

    $234$. Regroup from hundreds: $501=4$ hundreds $9$ tens $11$ ones, then subtract.

26. What is $402 - 2$?

    $400$. Subtract ones: $402 - 2 = 400$.

27. What is $658 - 234$?

    $424$. Subtract ones: $8-4=4$, tens: $5-3=2$, hundreds: $6-2=4$.

28. What is $999 - 400$?

    $599$. Subtract 4 hundreds from 9 hundreds, keeping 99.

29. Identify the missing number: $367 + \square = 900$.

    $533$. Find what adds to 367 to make 900: $900-367=533$.

30. What is $475 + 325$?

    $800$. Add ones: $5+5=10$ (carry 1), tens: $7+2+1=10$ (carry 1), hundreds: $4+3+1=8$.

31. What is $507 + 296$?

    $803$. Add with regrouping: $7+6=13$ (carry 1), $0+9+1=10$ (carry 1), $5+2+1=8$.

32. What is $458 + 200$?

    $658$. Add 2 hundreds to 458: $400 + 200 = 600$, plus $58 = 658$.

33. What is $689 - 234$?

    $455$. Subtract with regrouping: borrow from tens and hundreds.

34. What is $268 + 400$?

    $668$. Add 4 hundreds to 268: $200 + 400 = 600$, plus $68 = 668$.

35. What is $900 - 70$?

    $830$. Subtract 7 tens from 90 tens (900).

36. What is the value of the digit $9$ in the number $294$?

    $90$. The digit $9$ is in the tens place, so its value is $9 × 10$.

37. What is $586$ written in expanded form using hundreds, tens, and ones?

    $500 + 80 + 6$. Break into place values: 5 hundreds, 8 tens, 6 ones.

38. What is $298 + 405$?

    $703$. Add with regrouping: $8+5=13$ (carry 1), $9+0+1=10$ (carry 1), $2+4+1=7$.

39. What is $507 + 196$?

    $703$. Add with regrouping: $7 + 6 = 13$, carry $1$ to tens place.

40. What is $500 - 176$?

    $324$. Regroup 500 as 4 hundreds, 9 tens, 10 ones to subtract.

41. What is $900 - 400$?

    $500$. Subtract hundreds: $9 - 4 = 5$ hundreds.

42. What is $458 + 367$?

    $825$. Add with regrouping: $8+7=15$ (carry 1), $5+6+1=12$ (carry 1).

43. What is $630 - 280$?

    $350$. Subtract ones: $0-0=0$, tens: $3-8$ requires regrouping, $13-8=5$, hundreds: $5-2=3$.

44. What is $129 + 5$?

    $134$. Add $5$ ones to $129$: $9 + 5 = 14$, carry the $1$.

45. What is $368 + 124$?

    $492$. Add ones: $8+4=12$, carry 1; tens: $6+2+1=9$; hundreds: $3+1=4$.

46. What is $900 - 475$?

    $425$. Regroup $900$ as $8$ hundreds $9$ tens $10$ ones, then subtract place by place.

47. What is $376 + 289$?

    $665$. Use column addition with regrouping: $6 + 9 = 15$, carry $1$.

48. What is $586$ written in expanded form?

    $500 + 80 + 6$. Break the number into hundreds, tens, and ones place values.

49. What is $700 - 468$?

    $232$. Regroup from hundreds: $700=6$ hundreds $9$ tens $10$ ones, then subtract.

50. What is $602 - 158$?

    $444$. Regroup tens: $602=5$ hundreds $9$ tens $12$ ones, then subtract.

51. What is $701 - 258$?

    $443$. Use regrouping: borrow from hundreds and tens places.

52. What is $268 + 300$?

    $568$. Add $3$ hundreds to $268$: $200 + 300 + 68 = 568$.

53. What is the missing number: $325 + 199 =$?

    $524$. Add using place value and regrouping: $325 + 199 = 524$.

54. Identify the missing number: $356 + \square = 500$.

    $144$. Find the difference: $500-356=144$.

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