Sum to 10,000

Directions: Using the digits 1-9 at most one time each, find the closest sum to 10,000 using two 4-digit addends.

Hint

Which digits will be the most helpful to focus on to make the solution as close to 10,000 as possible?

Answer

10,000 = (6521+3479) or (5671+4329) or (5679+4321) & other mixes of the same numbers in different positions

Source: Jessica Goree

Check Also

Comparing Fractions

Directions: Using the numbers 1-9, each one time only, fill in the blanks to make …

5 comments

  1. captain obvious jr.

    7351+2649=10,000

  2. captain obvious jr.

    7,351+2,649=10,000

  3. Rudolf Österreicher

    All 48 solutions (excluding the ones where the addends are swapped):
    2 341 + 7 659 = 10 000
    2 349 + 7 651 = 10 000
    2 351 + 7 649 = 10 000
    2 359 + 7 641 = 10 000
    2 431 + 7 569 = 10 000
    2 439 + 7 561 = 10 000
    2 461 + 7 539 = 10 000
    2 469 + 7 531 = 10 000
    2 531 + 7 469 = 10 000
    2 539 + 7 461 = 10 000
    2 561 + 7 439 = 10 000
    2 569 + 7 431 = 10 000
    2 641 + 7 359 = 10 000
    2 649 + 7 351 = 10 000
    2 651 + 7 349 = 10 000
    2 659 + 7 341 = 10 000
    3 241 + 6 759 = 10 000
    3 249 + 6 751 = 10 000
    3 251 + 6 749 = 10 000
    3 259 + 6 741 = 10 000
    3 421 + 6 579 = 10 000
    3 429 + 6 571 = 10 000
    3 471 + 6 529 = 10 000
    3 479 + 6 521 = 10 000
    3 521 + 6 479 = 10 000
    3 529 + 6 471 = 10 000
    3 571 + 6 429 = 10 000
    3 579 + 6 421 = 10 000
    3 741 + 6 259 = 10 000
    3 749 + 6 251 = 10 000
    3 751 + 6 249 = 10 000
    3 759 + 6 241 = 10 000
    4 231 + 5 769 = 10 000
    4 239 + 5 761 = 10 000
    4 261 + 5 739 = 10 000
    4 269 + 5 731 = 10 000
    4 321 + 5 679 = 10 000
    4 329 + 5 671 = 10 000
    4 371 + 5 629 = 10 000
    4 379 + 5 621 = 10 000
    4 621 + 5 379 = 10 000
    4 629 + 5 371 = 10 000
    4 671 + 5 329 = 10 000
    4 679 + 5 321 = 10 000
    4 731 + 5 269 = 10 000
    4 739 + 5 261 = 10 000
    4 761 + 5 239 = 10 000
    4 769 + 5 231 = 10 000

    All solutions have a 1 and 9 in the ones position.

    The sums closest to – but not equal to 10 000 – are 9 999 (192 solutions excluding ones where the addends are swapped) and 10 001 (48 solutions excluding ones where the addends are swapped)
    1234 + 8765 = 9999
    1235 + 8764 = 9999
    1243 + 8756 = 9999
    1246 + 8753 = 9999
    1253 + 8746 = 9999
    1256 + 8743 = 9999
    1264 + 8735 = 9999
    1265 + 8734 = 9999
    1324 + 8675 = 9999
    1325 + 8674 = 9999
    1342 + 8657 = 9999
    1347 + 8652 = 9999
    1352 + 8647 = 9999
    1357 + 8642 = 9999
    1374 + 8625 = 9999
    1375 + 8624 = 9999
    1423 + 8576 = 9999
    1426 + 8573 = 9999
    1432 + 8567 = 9999
    1437 + 8562 = 9999
    1462 + 8537 = 9999
    1467 + 8532 = 9999
    1473 + 8526 = 9999
    1476 + 8523 = 9999
    1523 + 8476 = 9999
    1526 + 8473 = 9999
    1532 + 8467 = 9999
    1537 + 8462 = 9999
    1562 + 8437 = 9999
    1567 + 8432 = 9999
    1573 + 8426 = 9999
    1576 + 8423 = 9999
    1624 + 8375 = 9999
    1625 + 8374 = 9999
    1642 + 8357 = 9999
    1647 + 8352 = 9999
    1652 + 8347 = 9999
    1657 + 8342 = 9999
    1674 + 8325 = 9999
    1675 + 8324 = 9999
    1734 + 8265 = 9999
    1735 + 8264 = 9999
    1743 + 8256 = 9999
    1746 + 8253 = 9999
    1753 + 8246 = 9999
    1756 + 8243 = 9999
    1764 + 8235 = 9999
    1765 + 8234 = 9999
    2134 + 7865 = 9999
    2135 + 7864 = 9999
    2143 + 7856 = 9999
    2146 + 7853 = 9999
    2153 + 7846 = 9999
    2156 + 7843 = 9999
    2164 + 7835 = 9999
    2165 + 7834 = 9999
    2314 + 7685 = 9999
    2315 + 7684 = 9999
    2341 + 7658 = 9999
    2348 + 7651 = 9999
    2351 + 7648 = 9999
    2358 + 7641 = 9999
    2384 + 7615 = 9999
    2385 + 7614 = 9999
    2413 + 7586 = 9999
    2416 + 7583 = 9999
    2431 + 7568 = 9999
    2438 + 7561 = 9999
    2461 + 7538 = 9999
    2468 + 7531 = 9999
    2483 + 7516 = 9999
    2486 + 7513 = 9999
    2513 + 7486 = 9999
    2516 + 7483 = 9999
    2531 + 7468 = 9999
    2538 + 7461 = 9999
    2561 + 7438 = 9999
    2568 + 7431 = 9999
    2583 + 7416 = 9999
    2586 + 7413 = 9999
    2614 + 7385 = 9999
    2615 + 7384 = 9999
    2641 + 7358 = 9999
    2648 + 7351 = 9999
    2651 + 7348 = 9999
    2658 + 7341 = 9999
    2684 + 7315 = 9999
    2685 + 7314 = 9999
    2834 + 7165 = 9999
    2835 + 7164 = 9999
    2843 + 7156 = 9999
    2846 + 7153 = 9999
    2853 + 7146 = 9999
    2856 + 7143 = 9999
    2864 + 7135 = 9999
    2865 + 7134 = 9999
    3124 + 6875 = 9999
    3125 + 6874 = 9999
    3142 + 6857 = 9999
    3147 + 6852 = 9999
    3152 + 6847 = 9999
    3157 + 6842 = 9999
    3174 + 6825 = 9999
    3175 + 6824 = 9999
    3214 + 6785 = 9999
    3215 + 6784 = 9999
    3241 + 6758 = 9999
    3248 + 6751 = 9999
    3251 + 6748 = 9999
    3258 + 6741 = 9999
    3284 + 6715 = 9999
    3285 + 6714 = 9999
    3412 + 6587 = 9999
    3417 + 6582 = 9999
    3421 + 6578 = 9999
    3428 + 6571 = 9999
    3471 + 6528 = 9999
    3478 + 6521 = 9999
    3482 + 6517 = 9999
    3487 + 6512 = 9999
    3512 + 6487 = 9999
    3517 + 6482 = 9999
    3521 + 6478 = 9999
    3528 + 6471 = 9999
    3571 + 6428 = 9999
    3578 + 6421 = 9999
    3582 + 6417 = 9999
    3587 + 6412 = 9999
    3714 + 6285 = 9999
    3715 + 6284 = 9999
    3741 + 6258 = 9999
    3748 + 6251 = 9999
    3751 + 6248 = 9999
    3758 + 6241 = 9999
    3784 + 6215 = 9999
    3785 + 6214 = 9999
    3824 + 6175 = 9999
    3825 + 6174 = 9999
    3842 + 6157 = 9999
    3847 + 6152 = 9999
    3852 + 6147 = 9999
    3857 + 6142 = 9999
    3874 + 6125 = 9999
    3875 + 6124 = 9999
    4123 + 5876 = 9999
    4126 + 5873 = 9999
    4132 + 5867 = 9999
    4137 + 5862 = 9999
    4162 + 5837 = 9999
    4167 + 5832 = 9999
    4173 + 5826 = 9999
    4176 + 5823 = 9999
    4213 + 5786 = 9999
    4216 + 5783 = 9999
    4231 + 5768 = 9999
    4238 + 5761 = 9999
    4261 + 5738 = 9999
    4268 + 5731 = 9999
    4283 + 5716 = 9999
    4286 + 5713 = 9999
    4312 + 5687 = 9999
    4317 + 5682 = 9999
    4321 + 5678 = 9999
    4328 + 5671 = 9999
    4371 + 5628 = 9999
    4378 + 5621 = 9999
    4382 + 5617 = 9999
    4387 + 5612 = 9999
    4612 + 5387 = 9999
    4617 + 5382 = 9999
    4621 + 5378 = 9999
    4628 + 5371 = 9999
    4671 + 5328 = 9999
    4678 + 5321 = 9999
    4682 + 5317 = 9999
    4687 + 5312 = 9999
    4713 + 5286 = 9999
    4716 + 5283 = 9999
    4731 + 5268 = 9999
    4738 + 5261 = 9999
    4761 + 5238 = 9999
    4768 + 5231 = 9999
    4783 + 5216 = 9999
    4786 + 5213 = 9999
    4823 + 5176 = 9999
    4826 + 5173 = 9999
    4832 + 5167 = 9999
    4837 + 5162 = 9999
    4862 + 5137 = 9999
    4867 + 5132 = 9999
    4873 + 5126 = 9999
    4876 + 5123 = 9999

    1342 + 8659 = 10001
    1349 + 8652 = 10001
    1352 + 8649 = 10001
    1359 + 8642 = 10001
    1432 + 8569 = 10001
    1439 + 8562 = 10001
    1462 + 8539 = 10001
    1469 + 8532 = 10001
    1532 + 8469 = 10001
    1539 + 8462 = 10001
    1562 + 8439 = 10001
    1569 + 8432 = 10001
    1642 + 8359 = 10001
    1649 + 8352 = 10001
    1652 + 8349 = 10001
    1659 + 8342 = 10001
    3142 + 6859 = 10001
    3149 + 6852 = 10001
    3152 + 6849 = 10001
    3159 + 6842 = 10001
    3412 + 6589 = 10001
    3419 + 6582 = 10001
    3482 + 6519 = 10001
    3489 + 6512 = 10001
    3512 + 6489 = 10001
    3519 + 6482 = 10001
    3582 + 6419 = 10001
    3589 + 6412 = 10001
    3842 + 6159 = 10001
    3849 + 6152 = 10001
    3852 + 6149 = 10001
    3859 + 6142 = 10001
    4132 + 5869 = 10001
    4139 + 5862 = 10001
    4162 + 5839 = 10001
    4169 + 5832 = 10001
    4312 + 5689 = 10001
    4319 + 5682 = 10001
    4382 + 5619 = 10001
    4389 + 5612 = 10001
    4612 + 5389 = 10001
    4619 + 5382 = 10001
    4682 + 5319 = 10001
    4689 + 5312 = 10001
    4832 + 5169 = 10001
    4839 + 5162 = 10001
    4862 + 5139 = 10001
    4869 + 5132 = 10001

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