https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-add-ones-tens-hundreds/v/adding-ten-or-one-hundred 2021-05-18T23:20:46Z Adding 10 or 100 Sal adds 1, 10, or 100 to a number. video https://cdn.kastatic.org/googleusercontent/OW9E4ZsncTq_E03bNQ32Jz599ZQ1jPMw4pidJlfFt2ZyqNkzX9WlEvJH5CF5PwU1hanuI01-fuL429-60o7ZReXX9A Adding 10 or 100 Sal adds 1, 10, or 100 to a number. https://cdn.kastatic.org/ka-youtube-converted/wwO6DjL_wFw.mp4/wwO6DjL_wFw.mp4 239 Adición y sustracción de números hasta el 1.000 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-strategies-for-adding-two-and-three-digit-numbers/e/add-within-1000--level-1 2026-04-08T01:15:04.085520103Z Add 10s and 100s (no regrouping) Practice solving problems like 344+20 and 344+200. Sharon Friedman exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-add-ones-tens-hundreds/v/adding-hundreds-tens-and-ones 2021-07-06T11:21:36Z Adding 1s, 10s, and 100s Sal adds 3-digit numbers by adding ones, tens, and hundreds. video https://cdn.kastatic.org/googleusercontent/z7b-NtC_5jkxqVXl0tiaHRuWttWMBKNMUl1DpurWULmT96DRQFGDWkDJCbytpgUM-QTzK0T4-RreH7zw0QadbCt_ Adding 1s, 10s, and 100s Sal adds 3-digit numbers by adding ones, tens, and hundreds. https://cdn.kastatic.org/ka-youtube-converted/SCBp0d6zR2I.mp4/SCBp0d6zR2I.mp4 217 Adición y sustracción de números hasta el 1.000 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/cc-2nd-strategies-for-adding-two-and-three-digit-numbers/v/adding-three-digit-numbers-without-regrouping 2021-07-06T11:21:37Z Adding 3-digit numbers (no regrouping) Sal adds 327 + 251 thinking about place value. video https://cdn.kastatic.org/googleusercontent/TAIc_HqezyamXGSasYwarzgI7AxBSXA1RJEd-EPwEeIqbxPxq9fD-KtuGAbeMqAQ6YR0JxV3LRxUbFaD7Au6f7A4Qw Adding 3-digit numbers (no regrouping) Sal adds 327 + 251 thinking about place value. https://cdn.kastatic.org/ka-youtube-converted/d3109sV6izY.mp4/d3109sV6izY.mp4 160 Adición y sustracción de números hasta el 1.000 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 Adición y sustracción de números hasta el 1.000 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 Adición y sustracción de números hasta el 1.000 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 Adición y sustracción de números hasta el 1.000 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/imp-strategies-for-adding-two-and-three-digit-numbers/v/addition-using-groups-of-10-and-100 2021-05-18T23:20:44Z Addition using groups of 10 and 100 Sal rewrites addition problems to make them easier to solve. video https://cdn.kastatic.org/googleusercontent/pbyapocY2vyhPgKLRv_1i5h3aTYmSYUvxJFah9IBOBxbaJrC_LdxMDp2HshH31LIaWHRcbw7BM1KTuLvgS7M_Tk Addition using groups of 10 and 100 Sal rewrites addition problems to make them easier to solve. https://cdn.kastatic.org/ka-youtube-converted/Nq88IHw4Y9E.mp4/Nq88IHw4Y9E.mp4 238 Adición y sustracción de números hasta el 1.000 https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-strategies-for-adding-two-and-three-digit-numbers/e/making-100-and-1000 2021-05-18T23:20:44Z Add using groups of 10 and 100 Practice making groups of 10 and 100 while adding 3-digit numbers.  Lindsay Spears exercise 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 Adición y sustracción de números hasta el 1.000 https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-strategies-for-adding-two-and-three-digit-numbers/e/adding-and-subtracting-within-1000-using-a-number-line 2024-03-17T14:18:47.660728496Z Add on a number line Practice adding numbers like 554 and 237 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-1000/x3184e0ec:adding-up-to-four-2-digit-numbers/v/adding-multiple-2-digit-numbers-word-problems 2021-07-01T15:38:18Z Adding multiple 2-digit numbers word problems Sal solve word problems that involve adding multiple two digit numbers by using place value. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Adding multiple 2-digit numbers word problems Sal solve word problems that involve adding multiple two digit numbers by using place value. https://cdn.kastatic.org/ka-youtube-converted/WJNOtHFN-mM.mp4/WJNOtHFN-mM.mp4 210 Adición y sustracción de números hasta el 1.000 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-more-fewer-100/e/adding-and-subtracting-on-the-number-line-word-problems 2025-05-07T16:31:35.042641944Z Add and subtract on the number line word problems Practice solving addition or subtraction word problems using a number line. All items include 4 two-digit numbers. elizabeth exercise https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-strategies-for-adding-two-and-three-digit-numbers/e/select-strategies-for-adding-within-1000 2022-07-26T19:33:05.713343025Z Select strategies for adding within 1000 Practice telling which strategies work for adding two numbers within 1000. Lindsay exercise https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-1000/x3184e0ec:adding-up-to-four-2-digit-numbers/e/add-within-100--level-2 2021-06-05T01:51:59Z Adding up to four 2-digit numbers Practice solving problems that include four 2-digit numbers. Casey McCann exercise