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 Addition within 10,000 (with and without regrouping) https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-adding-with-regrouping-within-1000/v/carrying-when-adding-three-digit-numbers 2023-06-01T14:45:55.494628927Z Using place value to add 3-digit numbers: part 1 Let's explore adding two 3-digit numbers using place value and carrying. We walk through the process step by step, starting with the ones place, then the tens place, and finally the hundreds place. We emphasize the importance of understanding what carrying means and how it relates to place value. Sal Khan video https://cdn.kastatic.org/googleusercontent/OZlCq4HL96fODSwYxjvS5mSuYVP9IdkkVSNiI-MwW8atmlb6TmLiliXRB9UcMFNn7qQKxPcEOpi3kKApuzIj0PA Using place value to add 3-digit numbers: part 1 Let's explore adding two 3-digit numbers using place value and carrying. We walk through the process step by step, starting with the ones place, then the tens place, and finally the hundreds place. We emphasize the importance of understanding what carrying means and how it relates to place value. https://cdn.kastatic.org/ka-youtube-converted/Wm0zq-NqEFs.mp4/Wm0zq-NqEFs.mp4 146 Addition within 10,000 (with and without regrouping) https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-adding-with-regrouping-within-1000/v/example-adding-with-carrying 2021-07-07T20:19:26Z Adding 3-digit numbers Learn to use regrouping, or carrying to add 709+996, 373+88, and 149+293. Sal Khan video https://cdn.kastatic.org/googleusercontent/hgHcTsRKnLiu92VE5fvxzDn7XZKd7qcCjoYBO84ozDq0K8hGjQPFJoZ9_CfOBHip-hg5Hhw_4u7AB5kY5x7f7RoJ Adding 3-digit numbers Learn to use regrouping, or carrying to add 709+996, 373+88, and 149+293. https://cdn.kastatic.org/ka-youtube-converted/9hM32lsQ4aI.mp4/9hM32lsQ4aI.mp4 184 Addition within 10,000 (with and without regrouping) https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-adding-with-regrouping-within-1000/e/addition_4 2026-04-30T18:30:41.846286703Z Add within 1000 Practice adding three-digit numbers. All sums are 1000 or less. Lukas Domagala 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/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 Addition within 10,000 (with and without regrouping) https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/estimate-to-add-multi-digit-numbers/v/estimating-adding-large-numbers-by-rounding 2023-06-01T14:45:55.494628927Z Estimating when adding multi-digit numbers Let's learn about estimating when adding multi-digit numbers. We see how to round numbers to the nearest 10 and then add them together to get an approximate sum. This technique is helpful for us when we need to make quick mental calculations and don't require an exact answer. video https://cdn.kastatic.org/googleusercontent/IJjQoKIpkSb7MOlzURIQuzBP2g4j0MJI7jk1D-jlWjj1MxrkPNVgNOv1pV3TqDqSqvOuHfO3c4ZMs-hYDNSmH0qI3w Estimating when adding multi-digit numbers Let's learn about estimating when adding multi-digit numbers. We see how to round numbers to the nearest 10 and then add them together to get an approximate sum. This technique is helpful for us when we need to make quick mental calculations and don't require an exact answer. https://cdn.kastatic.org/ka-youtube-converted/CZuYBGBClG0.mp4/CZuYBGBClG0.mp4 220 Addition within 10,000 (with and without regrouping) 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 https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/addition-and-subtraction-word-problems/v/three-digit-addition-word-problems 2022-10-06T09:25:13.606060383Z Three digit addition word problems Work through a word problems that involve 3-digit addition. video https://cdn.kastatic.org/googleusercontent/AvlDoxE0fWHPCIDTGwUYJzVzuNZuSZdbtGOsIZBBT784AZ_vKrouoCYvSIB_HLJpOEVarxU5HezHIksxRQkZlQE Three digit addition word problems Work through a word problems that involve 3-digit addition. https://cdn.kastatic.org/ka-youtube-converted/W3zji0qh658.mp4/W3zji0qh658.mp4 153 Addition within 10,000 (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