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 Intro to 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 Intro to 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 Intro to 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 Intro to 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