https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-ones-tens/v/comparing-adding-1-and-10 2021-02-15T02:44:58Z Adding 1 vs. adding 10 Sal talks about the difference between adding 1 and adding 10. video https://cdn.kastatic.org/googleusercontent/_8jKI-fgx7SsNG5bhsJq744a4mmhtmAU59qEZNCMfomutB2M_cGm9YIfdSnj9Mu-jsas_Nug8GlJJVFlWgoL_TGU Adding 1 vs. adding 10 Sal talks about the difference between adding 1 and adding 10. https://cdn.kastatic.org/ka-youtube-converted/mKsKU0BAiRM.mp4/mKsKU0BAiRM.mp4 137 Addition https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-ones-tens/e/add-within-100--level-1 2026-04-07T23:17:37.123726494Z Add 1 or 10 Practice solving problems like 34+1 and 34+10. Casey McCann exercise 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 Addition 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 Addition https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-ones-tens/e/adding-1s-or-10s-to-two-digit-numbers 2026-04-07T23:17:37.123726494Z Add 1s or 10s (no regrouping) Practice solving problems like 34+5 and 34+50. Cam 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 Addition 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 Addition 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-kindergarten-math/cc-kindergarten-add-subtract/kindergarten-add-sub-word-problem-within-10/e/addition-word-problems-within-10 2026-04-07T23:55:07.30621384Z Addition word problems within 10 Practice solving word problems by adding small numbers (numbers 10 or less). Gail Hargrave exercise