https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:add-within-20/v/adding-within-20-using-place-value-blocks 2021-06-14T17:20:20Z Adding within 20 using place value blocks Sal adds 8 + 6 using place value blocks. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Adding within 20 using place value blocks Sal adds 8 + 6 using place value blocks. https://cdn.kastatic.org/ka-youtube-converted/dDv4FTqKBmY.mp4/dDv4FTqKBmY.mp4 84 Intro to addition with 2-digit numbers https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:add-within-20/v/adding-within-20-using-ten-frames 2021-06-14T17:20:20Z Adding within 20 using ten frames Sal adds 8 + 7 using ten frames. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Adding within 20 using ten frames Sal adds 8 + 7 using ten frames. https://cdn.kastatic.org/ka-youtube-converted/UzQnoXrJg1o.mp4/UzQnoXrJg1o.mp4 158 Intro to addition with 2-digit numbers https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:add-within-20/e/add-within-20-visually 2026-04-07T22:59:30.107127435Z Add within 20 visually Add within 20 using number lines, place value blocks, ten frames, and groups of objects. Kami Soltesz exercise https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:add-within-20/e/addition_2 2023-06-12T14:49:44.358100262Z Add within 20 Practice adding. All numbers in these problems are 20 or less. johnfn exercise https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-two-dig-intro/v/adding-two-digit-numbers-no-regrouping 2021-06-24T11:10:10Z Adding 2-digit numbers without regrouping 1 Sal adds 71 + 24. video https://cdn.kastatic.org/googleusercontent/IvbAIEVP6EeKusoVBSkQ5R0oNqekZakJxdDc1AnE4njqQUSBdPTSXod9bIxwa2QEMo7aPZipE_kn2qEYHsOuq8quyw Adding 2-digit numbers without regrouping 1 Sal adds 71 + 24. https://cdn.kastatic.org/ka-youtube-converted/EV38zfiY6Vs.mp4/EV38zfiY6Vs.mp4 113 Intro to addition with 2-digit numbers 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 Intro to addition with 2-digit numbers https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-math-strategies-for-adding-within-100/v/breaking-apart-two-digit-addition-problems 2021-06-24T11:10:10Z Breaking apart 2-digit addition problems Sal thinks about different ways to break up addition problems.  video https://cdn.kastatic.org/googleusercontent/KPcEkaLVN9Bs15WtpTSvPdpA0sigmoWLfzm8TObNUPZqZ2hRtYE1p-OeQDK5ZZ6KOUZPfNgAR3K7Q6DWTmcCZvAtqg Breaking apart 2-digit addition problems Sal thinks about different ways to break up addition problems.  https://cdn.kastatic.org/ka-youtube-converted/UjfmOmPARyk.mp4/UjfmOmPARyk.mp4 288 Intro to addition with 2-digit numbers https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-math-strategies-for-adding-within-100/e/breaking-apart-two-digit-addition-problems 2021-04-29T07:57:29Z Break apart 2-digit addition problems Practice breaking apart problems like 23+45 into problems like 20+40+3+5. Lindsay exercise https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-two-dig-intro/v/regrouping-when-adding-two-digit-and-one-digit-number 2021-04-03T21:31:54Z Regrouping to add 1-digit number Sal adds 35 + 6. video https://cdn.kastatic.org/googleusercontent/fya0nZADP-WoqTA_VT2UF-sAtF7R23HLfzrL0smFqgTLxa8LPH8QHrvvBsHh8GTzJqZaZEs9K_E4biCLLhj36yXu Regrouping to add 1-digit number Sal adds 35 + 6. https://cdn.kastatic.org/ka-youtube-converted/G1cNKc3PD74.mp4/G1cNKc3PD74.mp4 253 Intro to addition with 2-digit numbers https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-math-strategies-for-adding-within-100/v/adding-by-getting-to-group-of-10-first 2021-06-24T19:33:07Z Adding by making a group of 10 Sal adds 5+68 by breaking the 5 into a 2 and a 3. video https://cdn.kastatic.org/googleusercontent/-uz_7SXu4tIiihh7ZwecHu3CVQd903F_l6W-g433-xf2m1xim7O5Q2yuyV6A9s9DJPcEq5yXBoJkQcfpWcG6zG80 Adding by making a group of 10 Sal adds 5+68 by breaking the 5 into a 2 and a 3. https://cdn.kastatic.org/ka-youtube-converted/DzJvR56Suss.mp4/DzJvR56Suss.mp4 170 Intro to addition with 2-digit numbers https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-two-dig-intro/e/regroup-two-digit-plus-one-digit 2026-04-08T01:15:04.085520103Z Regroup when adding 1-digit numbers Practice adding numbers like 45+8. Lindsay exercise