https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/adding-two-digit-numbers-without-regrouping 2021-06-24T11:10:10Z Adding 2-digit numbers without regrouping Sal adds 23 + 45 thinking about place value. video https://cdn.kastatic.org/googleusercontent/aHJeEmGMU9FLixIOC6lZRtbi7m-PtaxSZUsA2HzIBEc28aTWyJlzs2nBYi96OKZT3a4blcH53hOgemy61KD828U Adding 2-digit numbers without regrouping Sal adds 23 + 45 thinking about place value. https://cdn.kastatic.org/ka-youtube-converted/K5rmfHlHy20.mp4/K5rmfHlHy20.mp4 154 Visually adding within 100 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/understanding-place-value-when-adding-ones 2021-06-24T11:10:09Z Understanding place value when adding ones Sal adds 37 + 2 by thinking about place value. video https://cdn.kastatic.org/googleusercontent/suPl8aA7-kHcmKdFyNSEzuNSUiLIxG6pQNq_aEK8VnUpjfB-P5pArtqnKpJjmNSpCkcOMM7rI2Fwx42_btWY2OY Understanding place value when adding ones Sal adds 37 + 2 by thinking about place value. https://cdn.kastatic.org/ka-youtube-converted/7_QPAdHILzw.mp4/7_QPAdHILzw.mp4 156 Visually adding within 100 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/understanding-place-value-while-adding-tens 2021-06-24T11:10:10Z Understanding place value when adding tens Sal adds 23 + 30 by thinking about place value. video https://cdn.kastatic.org/googleusercontent/6maBE8dKBgp9XhS7vwVX-hMUzKocEu8HlDNUzCOruU6ifVeYIoJpmZl4PTmsdWba8K2XY9efVObpUQgzr1ZvwD1d Understanding place value when adding tens Sal adds 23 + 30 by thinking about place value. https://cdn.kastatic.org/ka-youtube-converted/Dy5uDkOoMNc.mp4/Dy5uDkOoMNc.mp4 196 Visually adding within 100 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/addition-with-regrouping 2021-07-06T11:21:36Z Adding with regrouping Sal adds 35 + 27 thinking about place value.  video https://cdn.kastatic.org/googleusercontent/rjalosAIAPnHmvcw8tJP1IKxRMdvlrYc3IHxpziGB7p79bI6H9jyU0kVSvjpami2Marxte-6p4DGoJfYdYEBmU4 Adding with regrouping Sal adds 35 + 27 thinking about place value.  https://cdn.kastatic.org/ka-youtube-converted/8mcTsyV56jI.mp4/8mcTsyV56jI.mp4 276 Visually adding within 100 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/e/add-sub-within-100-w-num-line 2026-04-07T22:23:57.656416987Z Add within 100 using a number line Practice adding numbers using a number line. Numbers used in these problems are all less than 100. Lindsay 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 Visually adding within 100 https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/e/addition_3 2026-03-24T23:41:07.080866137Z Add within 100 using place value blocks Practice adding numbers within 100 using place value blocks. Lukas Domagala exercise