https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-strategies-for-adding-two-and-three-digit-numbers/v/breaking-apart-three-digit-addition-problems 2021-04-03T21:31:52Z Breaking apart 3-digit addition problems Sal shows ways to break up addition problems using place value. video https://cdn.kastatic.org/googleusercontent/wunViDe_30HF0vaOQKWzFlnbDnovByLHD6W_MHoXTcJU4iKfPHyysWVKxD_LOP6GpxkXjkabcgp0HYMbOOAiGuM Breaking apart 3-digit addition problems Sal shows ways to break up addition problems using place value. https://cdn.kastatic.org/ka-youtube-converted/Hc9mcx739js.mp4/Hc9mcx739js.mp4 222 Strategies for adding two and three-digit numbers https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-strategies-for-adding-two-and-three-digit-numbers/e/break-apart-three-dig-add 2022-07-27T14:52:42.217615992Z Break apart 3-digit addition problems Practice breaking apart big addition problems using place value. For example, 234+567 is the same as 200+500+30+60+4+7. Lindsay 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 Strategies for adding two and three-digit numbers 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 Strategies for adding two and three-digit numbers 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/kmap/numbers-and-operations-the-real-complex-number-system-192-202lp/x30cbe10bfecf22dc:addition-and-subtraction/x30cbe10bfecf22dc:strategies-for-adding-two-and-three-digit-numbers/v/estimating-adding-and-subtracting-3-digit-numbers 2022-10-07T06:47:27.151808908Z Estimating adding and subtracting 3-digit numbers Use estimation to find reasonable solutions to addition and subtraction problems. video https://cdn.kastatic.org/ka_thumbnails_cache/5ffda36e-d4ec-4e6f-9840-127dae529a6b_1280_720_base.png Estimating adding and subtracting 3-digit numbers Use estimation to find reasonable solutions to addition and subtraction problems. https://cdn.kastatic.org/ka-youtube-converted/cUKmbQjpu5A.mp4/cUKmbQjpu5A.mp4 209 Strategies for adding two and three-digit numbers https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/estimate-to-add-multi-digit-numbers/e/estimate-to-add-multi-digit-whole-numbers- 2025-06-24T14:43:14.98588327Z Estimate to add multi-digit whole numbers Use estimation to find a reasonable solution to multi-digit addition problems. Numbers are less than or equal to 1000. Lindsay exercise