Whole-Number Addition/Subtraction - ISEE Lower Level Mathematics Achievement

1. What is the difference $5{,}000 - 2{,}938$?

   $2{,}062$. Subtraction aligns place values, borrows across multiple zeros from the thousands place.

2. What is the sum $999 + 999$?

   $1{,}998$. Addition of two 999s requires carrying 1 from each place value to the next.

3. What is the sum $125 + 79$?

   $204$. Addition aligns place values, carries over from units (5+9=14) and tens (2+7+1=10) to hundreds.

4. What is the difference $1{,}500 - 999$?

   $501$. Subtraction aligns place values, requires borrowing across places to subtract 999.

5. What is the difference $72 - 35$?

   $37$. Subtraction aligns place values, subtracts units (2-5 requires borrow, 12-5=7), then tens (6-3=3).

6. What is the difference $15 - 9$?

   $6$. Subtraction finds the difference by taking away 9 from 15 without borrowing.

7. What is the sum $2{,}346 + 1{,}709$?

   $4{,}055$. Addition aligns place values, carries over multiple times from units through thousands.

8. What is the sum $12{,}345 + 54{,}321$?

   $66{,}666$. Addition aligns place values, resulting in 6 in each digit due to the specific number patterns.

9. What is the sum $3{,}508 + 492$?

   $4{,}000$. Addition aligns place values, with multiple carries leading to a round number.

10. What is the difference $10{,}000 - 1$?

    $9{,}999$. Subtraction of 1 from 10,000 requires borrowing across all place values.

11. What is the difference $2{,}000 - 1{,}999$?

    $1$. Subtraction of 1,999 from 2,000 requires borrowing across all places, leaving 1.

12. What is the sum $560 + 440$?

    $1{,}000$. Addition aligns place values, with carrying from tens (6+4=10) to hundreds.

13. What is the sum $36 + 48$?

    $84$. Addition aligns place values, adds units (6+8=14, carry 1), then tens (3+4+1=8).

14. What is the difference $300 - 168$?

    $132$. Subtraction aligns place values, borrows for units (0-8) and tens (0-6) from hundreds.

15. What is the sum $8 + 7$?

    $15$. Addition combines the two single-digit numbers directly without carrying.

16. What is the difference $4{,}000 - 2{,}005$?

    $1{,}995$. Subtraction aligns place values, requires borrowing from thousands for units and subsequent places.

17. What is the difference $800 - 275$?

    $525$. Subtraction aligns place values, requires borrowing for units and tens from hundreds.

18. What is the sum $6{,}666 + 3{,}334$?

    $10{,}000$. Addition aligns place values, with carries in every place leading to 10,000.

19. What is the difference $6{,}200 - 1{,}200$?

    $5{,}000$. Subtraction aligns place values, subtracting equal amounts from thousands and hundreds without borrowing.

20. What is the sum $407 + 95$?

    $502$. Addition aligns place values, carries from units (7+5=12) and tens (0+9+1=10) to hundreds.

21. What is the difference $9{,}000 - 4{,}567$?

    $4{,}433$. Subtraction aligns place values, requires borrowing from thousands for each lower place.

22. What is the sum $9{,}999 + 1$?

    $10{,}000$. Addition of 1 to 9,999 causes carrying over through all digits to reach the next power of 10.

23. What is the sum $7{,}070 + 930$?

    $8{,}000$. Addition aligns place values, with carries from units and tens to reach a round thousand.

24. What is the sum $4{,}321 + 678$?

    $4{,}999$. Addition aligns place values, with carries in units, tens, and hundreds resulting in all 9s.

25. What is the difference $1{,}000 - 475$?

    $525$. Subtraction aligns place values, borrows across zeros for units (0-5) and tens (0-7) from thousands.

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