{"id":51413,"date":"2026-02-11T18:26:05","date_gmt":"2026-02-11T18:26:05","guid":{"rendered":"https:\/\/www.oracletutoring.ca\/blog\/?p=51413"},"modified":"2026-02-11T18:26:07","modified_gmt":"2026-02-11T18:26:07","slug":"calculator-usage-binary-octal-and-hex-on-the-casio-fx-991es-plus-c-part-1","status":"publish","type":"post","link":"https:\/\/www.oracletutoring.ca\/blog\/calculator-usage-binary-octal-and-hex-on-the-casio-fx-991es-plus-c-part-1\/","title":{"rendered":"Calculator usage: binary, octal, and hex on the Casio fx-991ES PLUS C, part 1"},"content":{"rendered":"\n

Tutoring math and comp sci, specific device functions can be important. The tutor mentions how to convert from decimal to binary, octal, or hexadecimal with the Casio fx-991ES PLUS C.<\/h2>\n

\nThe following is according to my understanding.<\/p>\n

\nSome people might have noticed the green print above the x2<\/sup>, x▪<\/sup>, log, and ln keys: DEC, HEX, BIN, OCT. Yet, how does one access that functionality?<\/p>\n

\nTo do so, one can press MODE, then 4:BASE-N. Immediately, Dec appears above 0, signifying DEC (decimal) mode. Decimal mode is what people usually think in.<\/p>\n

\nTo convert from decimal to another base – for instance, binary – one first needs to key the number, then press =. Then, to convert that number to binary form, Shift, then log. Notice that the log key has BIN printed across the top. \n

\nExample: convert 89 to binary, octal, and hex.<\/p>\n

Solution:<\/p>\n

    \n
  1. MODE, then 4. One should see Dec above 0.<\/li>\n
  2. 89, then =. One should see Dec above 89.<\/li>\n
  3. To convert to binary, Shift then log. One should see Bin above a line of zeros with 1011001 at the end.<\/li>\n
  4. To convert to octal, Shift then ln. One should see Oct above some zeros with 131 at the end.<\/li>\n
  5. To convert to hex, Shift then x▪<\/sup>. One should see Hex above 59.<\/li>\n
  6. To return to dec, Shift then x2<\/sup>.<\/li>\n<\/ol>\n

    Importantly, to get back to normal computation mode, press MODE then 1.<\/p>\n

    I imagine I will have more posts to add about this general topic, but this seems enough for an introduction.<\/p>\n

    Source:<\/p>\n

    casio.com: fx-991ES PLUS C User’s Guide<\/p>\nJack of Oracle Tutoring by Jack and Diane,<\/a> Campbell River, BC.\n\n","protected":false},"excerpt":{"rendered":"

    Tutoring math and comp sci, specific device functions can be important. The tutor mentions how to convert from decimal to binary, octal, or hexadecimal with the Casio fx-991ES PLUS C. The following is according to my understanding. Some people might …<\/p>\n

    Calculator usage: binary, octal, and hex on the Casio fx-991ES PLUS C, part 1<\/span> Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90],"tags":[4039,403,295,4000,405,404,4040,4042,4041,4038],"class_list":["post-51413","post","type-post","status-publish","format-standard","hentry","category-calculator-usage","tag-bin","tag-binary","tag-casio-fx-991es","tag-casio-fx-991es-how-to-get-back-to-regular-normal-mode","tag-hex","tag-hexadecimal","tag-how-to-convert-from-decimal-to-binary-on-the-casio-fx-991es","tag-how-to-convert-from-decimal-to-hex-on-the-casio-fx-991es","tag-how-to-convert-from-decimal-to-octal-on-the-casio-fx-991es","tag-octal"],"_links":{"self":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/51413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/comments?post=51413"}],"version-history":[{"count":11,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/51413\/revisions"}],"predecessor-version":[{"id":51424,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/51413\/revisions\/51424"}],"wp:attachment":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/media?parent=51413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/categories?post=51413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/tags?post=51413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}