https://www.khanacademy.org/math/cc-kindergarten-math/cc-kindergarten-add-subtract/kindergarten-add-sub-intro/v/subtraction-introduction 2021-06-24T11:10:09Z Intro to subtraction Sal talks about what it means to subtract. The examples he uses are 4-3 and 5-2. Sal Khan video https://cdn.kastatic.org/googleusercontent/OIAdB4ITJNXl0oo_M0GIklCCgOoEH90OJuXh-k__OatTBXFQMA2tieQe83Kdwe9de4Z4hFnq7h61QpDz0jAxoe4 Intro to subtraction Sal talks about what it means to subtract. The examples he uses are 4-3 and 5-2. https://cdn.kastatic.org/ka-youtube-converted/AO9bHbUdg-M.mp4/AO9bHbUdg-M.mp4 219 Subtraction within 20* https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:subtract-within-20/v/subtracting-within-20 2021-06-24T19:33:07Z Subtracting 14 - 6 Sal subtracts 14 - 6 by first thinking about subtracting 2 and 4. Sal Khan video https://cdn.kastatic.org/googleusercontent/2gP3S47gAhnECIZEOvOdvNzNXOp64Uzsy878STJlRgYaRIDRd6xrjXQVGnjSen8GItcLkGAJ3QOYv6DicWcz_18 Subtracting 14 - 6 Sal subtracts 14 - 6 by first thinking about subtracting 2 and 4. https://cdn.kastatic.org/ka-youtube-converted/9McJ3GobPaY.mp4/9McJ3GobPaY.mp4 243 Subtraction within 20* https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:subtract-within-20/v/subtract-within-20-using-a-number-line 2021-06-10T22:38:10Z Subtract within 20 using a number line Sal subtracts 17 - 9 using a number line. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Subtract within 20 using a number line Sal subtracts 17 - 9 using a number line. https://cdn.kastatic.org/ka-youtube-converted/HjRcLJMHuVA.mp4/HjRcLJMHuVA.mp4 80 Subtraction within 20* https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:subtract-within-20/v/subtract-within-20-using-place-value-blocks 2021-06-10T22:38:08Z Subtract within 20 using place value blocks Sal subtracts 13-4 using place value blocks. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Subtract within 20 using place value blocks Sal subtracts 13-4 using place value blocks. https://cdn.kastatic.org/ka-youtube-converted/jhkYFCMUYwA.mp4/jhkYFCMUYwA.mp4 79 Subtraction within 20* https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:subtract-within-20/v/subtract-within-20-using-ten-frames 2021-06-11T18:04:39Z Subtract within 20 using ten frames Sal subtracts 13-6 using ten frames. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Subtract within 20 using ten frames Sal subtracts 13-6 using ten frames. https://cdn.kastatic.org/ka-youtube-converted/r8HsSXMn-4E.mp4/r8HsSXMn-4E.mp4 56 Subtraction within 20* https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:subtract-within-20/e/subtract-within-20-visually 2026-04-07T22:23:57.656416987Z Subtract within 20 visually Subtract within 20 using ten frames, place value blocks, number lines, and groups of objects. Kami Soltesz exercise https://www.khanacademy.org/math/cc-2nd-grade-math/x3184e0ec:add-and-subtract-within-20/x3184e0ec:subtract-within-20/e/subtraction_2 2021-04-30T09:50:43Z Subtract within 20 Practice subtracting. All numbers in these problems are 20 or less. Marcia Lee exercise https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-missing-number-within-20/e/missing-number-within-20--add-and-subtract- 2021-04-29T08:01:49Z Find missing number (add and subtract within 20) Learn how to solve problems like "___ - 7 = 18" where you don't know one of the values in an addition or subtraction equation. Lindsay exercise https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-subtract-10/v/relating-addition-and-subtraction 2021-06-24T11:10:09Z Relating addition and subtraction Sal shows the relationship between 2+3=5, 5-2=3, and 5-3=2. video https://cdn.kastatic.org/googleusercontent/eU1KRW8TV1yRiPju2ZEGkn712cxCWMpwUZArWOqZ7JesFn5jtu2Czp08KpW_8leoJX_B1p6my3N_HXI8KcyJv3w Relating addition and subtraction Sal shows the relationship between 2+3=5, 5-2=3, and 5-3=2. https://cdn.kastatic.org/ka-youtube-converted/zVLjWIftX_o.mp4/zVLjWIftX_o.mp4 125 Subtraction within 20* https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-subtract-10/e/relate-addition-and-subtraction 2026-04-07T23:36:17.218592739Z Relate addition and subtraction Practice seeing how addition and subtraction are related. Erin Kats exercise https://www.khanacademy.org/math/cc-kindergarten-math/cc-kindergarten-add-subtract/kindergarten-add-sub-word-problem-within-10/v/subtraction-word-problems-within-10 2021-06-24T11:10:09Z Subtraction word problems within 10 Sal solves word problems by subtracting small numbers (numbers 10 or less). video https://cdn.kastatic.org/googleusercontent/5xILqZm9oSKd4d-fMxhjcxtw8f5K-nPwLrGQBLAlrwoxmc9cLDGy0YJt_TA_2RoKfwpZCBlBbZyObNZs2KID27w2 Subtraction word problems within 10 Sal solves word problems by subtracting small numbers (numbers 10 or less). https://cdn.kastatic.org/ka-youtube-converted/qSkpZswoZTc.mp4/qSkpZswoZTc.mp4 63 Subtraction within 20* https://www.khanacademy.org/math/cc-kindergarten-math/cc-kindergarten-add-subtract/kindergarten-together-apart/e/take-apart 2026-04-07T23:36:17.218592739Z Subtract within 10 Practice subtracting by "taking apart" (with numbers less than 10). Gail Hargrave exercise https://www.khanacademy.org/math/1st-grade-math-revised-k-to-10-3-terms/x279f29007e7806ad:2nd-quarter/x279f29007e7806ad:subtraction-within-20/e/b6-subtraction-word-problems 2026-04-08T00:36:09.500768563Z Subtraction (word problems) Subtraction (word problems) ashish exercise