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 of numbers with sums up to 1,000,000 and subtraction of numbers where both numbers are less than 1,000,000 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-fourth-grade-math/imp-addition-and-subtraction-2/imp-adding-multi-digit-numbers/v/adding-multi-digit-numbers-with-place-value 2021-06-24T19:33:07Z Relate place value to standard algorithm for multi-digit addition Transition from a place value chart to standard algorithm when adding multi-digit numbers.  video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Relate place value to standard algorithm for multi-digit addition Transition from a place value chart to standard algorithm when adding multi-digit numbers.  https://cdn.kastatic.org/ka-youtube-converted/DqaHhReVpZI.mp4/DqaHhReVpZI.mp4 382 Addition of numbers with sums up to 1,000,000 and subtraction of numbers where both numbers are less than 1,000,000 https://www.khanacademy.org/math/cc-fourth-grade-math/imp-addition-and-subtraction-2/imp-adding-multi-digit-numbers/v/adding-multi-digit-numbers-with-regrouping 2021-06-30T17:51:14Z Adding multi-digit numbers: 48,029+233,930 Add 48,029+233,930 using the standard algorithm. video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Adding multi-digit numbers: 48,029+233,930 Add 48,029+233,930 using the standard algorithm. https://cdn.kastatic.org/ka-youtube-converted/TVtdqRNJmiw.mp4/TVtdqRNJmiw.mp4 138 Addition of numbers with sums up to 1,000,000 and subtraction of numbers where both numbers are less than 1,000,000 https://www.khanacademy.org/math/cc-fourth-grade-math/imp-addition-and-subtraction-2/imp-adding-multi-digit-numbers/e/multi-digit-addition 2025-02-26T12:18:43.931206682Z Multi-digit addition Add whole numbers with sums less than 1,000,000. Lindsay exercise https://www.khanacademy.org/math/cc-fourth-grade-math/imp-addition-and-subtraction-2/imp-subtracting-multi-digit-numbers/v/understanding-place-value-when-subtracting 2021-06-24T19:33:07Z Relate place value to standard algorithm for multi-digit subtraction Transition from a place value chart to standard algorithm when subtracting multi-digit numbers.  video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Relate place value to standard algorithm for multi-digit subtraction Transition from a place value chart to standard algorithm when subtracting multi-digit numbers.  https://cdn.kastatic.org/ka-youtube-converted/XAPhD7EDQUk.mp4/XAPhD7EDQUk.mp4 398 Addition of numbers with sums up to 1,000,000 and subtraction of numbers where both numbers are less than 1,000,000 https://www.khanacademy.org/math/cc-fourth-grade-math/imp-addition-and-subtraction-2/imp-subtracting-multi-digit-numbers/v/subtracting-multi-digit-numbers-with-regrouping 2021-06-30T17:51:15Z Multi-digit subtraction: 389,002-76,151 Subtract 389,002-76,151 using the standard algorithm. video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Multi-digit subtraction: 389,002-76,151 Subtract 389,002-76,151 using the standard algorithm. https://cdn.kastatic.org/ka-youtube-converted/buyK1y4rV3E.mp4/buyK1y4rV3E.mp4 201 Addition of numbers with sums up to 1,000,000 and subtraction of numbers where both numbers are less than 1,000,000 https://www.khanacademy.org/math/cc-fourth-grade-math/imp-addition-and-subtraction-2/imp-subtracting-multi-digit-numbers/e/multi-digit-subtraction 2025-02-26T12:18:43.931206682Z Multi-digit subtraction Subtract whole numbers that are less than or equal to 1,000,000. Lindsay exercise