https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:untitled-177/v/sea-monsters-and-superheroes 2021-01-25T15:40:03Z Addition and subtraction word problems: superheroes Sal solves 1 addition and 1 subtraction word problem. video https://cdn.kastatic.org/googleusercontent/qLdiyZbI1a5wb4gDz4Lz3HeYEZBU4ngqruqQDGwFNAz_R0yZUGASL7hZUdJl5OK7Sp0OWRPqPY7chFSXoWTbGlbZ Addition and subtraction word problems: superheroes Sal solves 1 addition and 1 subtraction word problem. https://cdn.kastatic.org/ka-youtube-converted/fGok2nHOjnI.mp4/fGok2nHOjnI.mp4 218 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-subtract-10/e/relate-addition-and-subtraction 2026-04-07T23:36:17.218592739Z Relate addition and subtraction Practice seeing how addition and subtraction are related. Erin Kats exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-sub-ones-tens/v/regrouping-to-subtract-one-digit-number 2021-04-03T21:31:52Z Subtracting a 1-digit number with regrouping Sal subtracts 35-8. video https://cdn.kastatic.org/googleusercontent/___BBODnuwNt4DeyXttV-81g3y3My2CXv65sl-6n1tJjKzSLfkD_-LZwDh1Nd5StqTsEPpogCpU3Bx2UGcN2y7uD Subtracting a 1-digit number with regrouping Sal subtracts 35-8. https://cdn.kastatic.org/ka-youtube-converted/zvetEuVJ0bE.mp4/zvetEuVJ0bE.mp4 191 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-sub-two-dig-intro/e/regroup-two-dig-minus-one-dig 2026-04-08T01:15:04.085520103Z Subtract 1-digit numbers with regrouping Practice solving problems like 46-9. Lindsay exercise https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/subtraction-within-100/v/introduction-to-regrouping-borrowing 2021-07-06T11:21:37Z Subtracting with regrouping (borrowing) Sal subtracts 25 from 83 by thinking about tens and ones. video https://cdn.kastatic.org/googleusercontent/1qheEcUH-VshquvTZL6jgf9MvPz-gpySAZNJW_HbUa4PTWJc1izfJFkahNPDTxUi5vz-4Zk8rta1lfrl3RZXtJBu Subtracting with regrouping (borrowing) Sal subtracts 25 from 83 by thinking about tens and ones. https://cdn.kastatic.org/ka-youtube-converted/egjDLFX9VHg.mp4/egjDLFX9VHg.mp4 327 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-sub-ones-tens/e/subtraction_3 2026-03-24T23:41:07.080866137Z Subtract within 100 using place value blocks Practice subtracting 2-digit numbers using place value blocks. Marcia Lee exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/correct-number-lines-for-addition-and-subtraction 2021-06-24T19:33:07Z Addition and subtraction with number lines Sal figures out which number line matches up with a 2-digit addition or subtraction problem. video https://cdn.kastatic.org/googleusercontent/Ni-0sD0f-4iKaD-kuuABb8P6CaSamrvjBMNNZV4Nx7ukbhthjgRvBR0UMeDTYHLMdOwBQXK1utfSdCWmPTiz6jbC Addition and subtraction with number lines Sal figures out which number line matches up with a 2-digit addition or subtraction problem. https://cdn.kastatic.org/ka-youtube-converted/I5xcZgyY4ag.mp4/I5xcZgyY4ag.mp4 117 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-sub-ones-tens/e/subtract-within-100-level-2 2026-04-08T00:54:09.631945657Z Subtract within 100 using a number line Practice subtracting numbers within 100 using a number line. Lindsay Spears exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-sub-100-word-problems/v/fewer-word-problems 2021-04-03T21:31:53Z Subtraction word problem: basketball Sal solves a word problem with the term "fewer". video https://cdn.kastatic.org/googleusercontent/AVzrsqqofKZVuSdP4O2fYWg4rfuTjxsOUXt8VLS-q3H1VjdnDZuEtI2PWYkFIgnRCMyG4O-BB2LcrOT7XmV0M7Ug Subtraction word problem: basketball Sal solves a word problem with the term "fewer". https://cdn.kastatic.org/ka-youtube-converted/qyvwN-2PoXA.mp4/qyvwN-2PoXA.mp4 132 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-sub-100-word-problems/v/using-crayons 2021-06-24T19:33:08Z Subtraction word problem: crayons Sal solves a subtraction word problem with numbers less than 100. video https://cdn.kastatic.org/googleusercontent/Eat9jFgtM1D4N-dJlcwWNlUb_Zpw0m2g73ylIrYjtmGL0Z2NpyIZEQJ59R3O4ZcWgM7JFP3HAqGlWLgXS90u5nZXzg Subtraction word problem: crayons Sal solves a subtraction word problem with numbers less than 100. https://cdn.kastatic.org/ka-youtube-converted/ZJ39gHgz_Dk.mp4/ZJ39gHgz_Dk.mp4 265 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-sub-100-word-problems/e/addition-and-subtraction-word-problems-within-100--level-2 2026-04-07T22:59:30.107127435Z Subtraction word problems within 100 Practice solving subtraction word problems. Numbers used are 100 or less. elizabeth exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-sub-ones-tens-hundreds/v/subtracting-hundreds-and-tens 2021-05-18T23:20:45Z Subtracting 1, 10, or 100 Sal subtracts 1, 10, or 100 from a number. video https://cdn.kastatic.org/googleusercontent/k--HGxHIan_egBr9X69lhp7obnePDV5J-0N9Vo-sw-MKaRVgY6WkpW4Pz_CG0iN6h2JFKwidO8quHMiw_qV3W76qVw Subtracting 1, 10, or 100 Sal subtracts 1, 10, or 100 from a number. https://cdn.kastatic.org/ka-youtube-converted/4BNIGTHUTTM.mp4/4BNIGTHUTTM.mp4 251 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-sub-ones-tens-hundreds/v/subtracting-3-digits 2021-07-06T11:21:36Z Subtracting 1s, 10s, and 100s Sal subtracts 3-digit numbers by subtracting ones, tens, and hundreds. video https://cdn.kastatic.org/googleusercontent/3yEKnhbtknObjYu2FYS7LhaCvzBE0GL1D6PW5T-U-voEODZIGc7Z60LzLgGrVIETKm823SrIoGeKAuUp6M95OjivUA Subtracting 1s, 10s, and 100s Sal subtracts 3-digit numbers by subtracting ones, tens, and hundreds. https://cdn.kastatic.org/ka-youtube-converted/ycBxbgjQns4.mp4/ycBxbgjQns4.mp4 192 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-sub-ones-tens-hundreds/v/subtracting-three-digit-numbers-without-regrouping 2021-05-18T23:20:47Z Subtracting 3-digit numbers (no regrouping) Sal shows how to subtract 357-251 with place value. video https://cdn.kastatic.org/googleusercontent/YaSG5DuGCZ-iL_0mWlTFolnZat8v93Hpz00bwrSIWjozTDKg2o6D2SMgPiuVS8pjIIa72j-Qvpfx52VZU-2gtQbQ Subtracting 3-digit numbers (no regrouping) Sal shows how to subtract 357-251 with place value. https://cdn.kastatic.org/ka-youtube-converted/i8r7ZTUqB9w.mp4/i8r7ZTUqB9w.mp4 177 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-sub-ones-tens-hundreds/e/subtract-within-1000--level-1 2026-04-07T23:36:17.218592739Z Subtract 10s and 100s (no regrouping) Practice subtracting 1, 10, or 100 from a number. Teri Lovelace exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-sub-ones-tens-hundreds/v/subtracting-with-place-value-blocks-regrouping 2022-11-24T00:44:27.489178686Z Subtracting with place value blocks (regrouping) Sal uses place value blocks to regroup and subtract 438-272. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/570f9f11-bfec-4079-8f39-3d5bbf21ac23_1280_720_base.png Subtracting with place value blocks (regrouping) Sal uses place value blocks to regroup and subtract 438-272. https://cdn.kastatic.org/ka-youtube-converted/F63kWrYg6fY.mp4/F63kWrYg6fY.mp4 149 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-sub-ones-tens-hundreds/e/subtract-within-1000--level-2 2026-04-07T22:59:30.107127435Z Subtract within 1,000 using place value blocks Practice solving subtraction problems using place value blocks. All numbers used are within 1000. Teri Lovelace exercise https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/strategies-for-subtracting-two-and-three-digit-numbers/v/subtraction-by-breaking-apart 2022-10-06T09:25:13.606060383Z Subtraction by breaking apart Solve 2- and 3-digit subtraction problems by breaking apart the numbers by place value. video https://cdn.kastatic.org/googleusercontent/7n6lBxkYakZEkMa93DBJCXCStFBl6wG5S093dGZHEwIWNaZkIx7Qt87iRcP4vWObroXTNA0d6laN_xzUfa_W8ss Subtraction by breaking apart Solve 2- and 3-digit subtraction problems by breaking apart the numbers by place value. https://cdn.kastatic.org/ka-youtube-converted/He4cjB2ectc.mp4/He4cjB2ectc.mp4 210 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-strategies-for-adding-two-and-three-digit-numbers/v/exercise-for-numberline-addition-and-subtraction 2021-07-12T13:50:37Z Adding and subtracting on number line Sal adds and subtracts numbers like 585 and 368 using a number line. Numbers used in these problems are less than 1000. video https://cdn.kastatic.org/googleusercontent/3vHZHL-qMkSrAizyphwgMg07yStyrR0nff6ahrt_T-W_8Y9ys6apjFEGMZEvU8BCUsInkVCkdIKDPfafN4tPzsJB Adding and subtracting on number line Sal adds and subtracts numbers like 585 and 368 using a number line. Numbers used in these problems are less than 1000. https://cdn.kastatic.org/ka-youtube-converted/WevZMyikGV4.mp4/WevZMyikGV4.mp4 145 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/strategies-for-subtracting-two-and-three-digit-numbers/e/subtract-on-a-number-line 2026-04-07T22:59:30.107127435Z Subtract on a number line Practice subtracting numbers like 784 and 391 using a number line. All numbers are less than 1000. Lindsay exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-more-fewer-100/v/multi-step-subtraction-word-problem 2022-10-07T02:31:07.468665539Z Multi-step subtraction word problem Sal solves a multi-step subtraction word problem using a tape diagram. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/dabd650f-ecb7-44a7-af51-55e556bcdc2f_1280_720_base.png Multi-step subtraction word problem Sal solves a multi-step subtraction word problem using a tape diagram. https://cdn.kastatic.org/ka-youtube-converted/qAUnDB0LZL4.mp4/qAUnDB0LZL4.mp4 257 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-more-fewer-100/e/addition-and-subtraction-word-problems-within-100--level-4 2021-07-01T17:20:34Z 2-step subtraction word problems within 100 Practice solving 2-step subtraction word problems. Numbers used are 100 or less. elizabeth exercise https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/addition-and-subtraction-word-problems/v/three-digit-subtraction-word-problems 2022-10-06T09:25:13.606060383Z Three digit subtraction word problems Work through a word problems that involve 3-digit subtraction. video https://cdn.kastatic.org/googleusercontent/nvLwjuzoRT1l1wwKiHwjWJ50zNZ5bWumGYq7-2gG2fuKGQjbHQ8V0VjlE8MrX9GgKXJuEFIDWurJMPUCUXIZMKuV Three digit subtraction word problems Work through a word problems that involve 3-digit subtraction. https://cdn.kastatic.org/ka-youtube-converted/4TcA1l01s9c.mp4/4TcA1l01s9c.mp4 173 Subtraction of numbers less than 1000 (with and without regrouping) https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/addition-and-subtraction-word-problems/e/add-and-subtract-within-1000-word-problems 2026-04-30T18:30:41.846286703Z Add and subtract within 1000 word problems Practice one-step addition and subtraction word problems with numbers less than 1000. Charlotte Auen exercise