https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-place-value/cc-1st-ones-tens/v/place-value-introduction 2021-06-24T11:10:09Z Intro to place value Sal uses the number 37 to explain why we use a "ones place" and a "tens place" when writing numbers.  Sal Khan video https://cdn.kastatic.org/googleusercontent/WOSBVwDSC8lY3Wlrxms89siOeh9MRzgZmm0tmHyGsFvn0XU-Vl_PYBFdxkWQnbwwi4OYD1LhxNHzkoso3oy9xowr Intro to place value Sal uses the number 37 to explain why we use a "ones place" and a "tens place" when writing numbers.  https://cdn.kastatic.org/ka-youtube-converted/wx2gI8iwMCA.mp4/wx2gI8iwMCA.mp4 359 Natural Numbers https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-place-value/x3184e0ec:intro-to-place-value/v/identifying-value-in-digits 2022-10-07T02:31:07.468665539Z Identifying value in digits Sal uses place value to identify the value of digits. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/b056000a-f022-4634-96db-510b00468e23_1280_720_base.png Identifying value in digits Sal uses place value to identify the value of digits. https://cdn.kastatic.org/ka-youtube-converted/Rh7eqv7y2xM.mp4/Rh7eqv7y2xM.mp4 162 Natural Numbers https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-place-value/x3184e0ec:intro-to-place-value/v/creating-the-largest-number 2021-02-12T18:13:59Z Creating the largest number Sal uses 3 numbers to show how to create the largest 3 digit number possible. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Creating the largest number Sal uses 3 numbers to show how to create the largest 3 digit number possible. https://cdn.kastatic.org/ka-youtube-converted/1guztZj-RSU.mp4/1guztZj-RSU.mp4 188 Natural Numbers https://www.khanacademy.org/math/cc-fourth-grade-math/imp-place-value-and-rounding-2/imp-ways-to-write-whole-numbers-expanded-form-and-written-form/v/place-value-3 2021-05-18T23:20:43Z Writing a number in expanded form Sal writes 14,897 in expanded form. Sal Khan video https://cdn.kastatic.org/googleusercontent/9AdZpmDa1kxh0AD60m3uyub58NF8c6zZ716NR0AGTyYrn8d4t1BfBNe_rmVhCqASmEJ_Jq8cssVxcorZXWXHUgk Writing a number in expanded form Sal writes 14,897 in expanded form. https://cdn.kastatic.org/ka-youtube-converted/iK0y39rjBgQ.mp4/iK0y39rjBgQ.mp4 320 Natural Numbers https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:week-1/x01cb2212e31ce997:integers/v/intro-to-the-number-line 2020-10-07T19:09:53Z Intro to the number line Let's look at how and why it is interesting to draw numbers as a line. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/c-UGxRBOaR2pishN0bMq89BLOAnGRaj6b1T0JabgkRyLonujRvLXOhX9ve76fX93RJI8tRwPyUW3NjOiboXBPzHj Intro to the number line Let's look at how and why it is interesting to draw numbers as a line. https://cdn.kastatic.org/ka-youtube-converted/x0tTvUyF3sM.mp4/x0tTvUyF3sM.mp4 208 Natural Numbers https://www.khanacademy.org/math/revision-up-math-class-6/x362f281d7ea4c7a1:week-1-revision-up-math-class-6/x362f281d7ea4c7a1:natural-numbers-revision-up-class-6-math/e/revision-natural-numbers-up-math-class-6 2026-04-07T22:23:57.656416987Z Revision Natural Numbers Practice problems for revision of Natural Numbers. Satya Swaroop exercise