flexbooks.ck12.org

Hovedinformasjon

ℹ️

Tittel: K-12 FlexBooks | CK-12 Foundation

Beskrivelse: CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks.

Nøkkelord: empty

Sidekoding: utf-8

Sidefilstørrelse: 296 KB

Serverinformasjon

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IP: 3.164.68.58

Sted: United States,US,,,37.751,-97.822,America/Chicago

Http-server: apache/2.4.58 (ubuntu)

Koding: utf-8

Metatags liste

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property: og:site_name itemprop: name name: author content: CK-12 Foundation
property: fb:app_id content: 159884644067996
itemprop: url content: https://www.ck12.org
itemprop: telephone content: (650) 494-1302
charset: utf-8
name: viewport content: width=device-width, initial-scale=1, minimum-scale=1.0
name: google-site-verification content: wHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
name: google-translate-customization content:
name: application-name content: CK-12 Foundation
name: msapplication-TileColor content: #003300
name: msapplication-TileImage content: //static.ck12.org/assets/favicon/web-app-manifest-192x192.png
property: og:description name: description content: CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks. helmet: true
property: og:url content: https://flexbooks.ck12.org/flexbooks/student/
itemprop: provider content: CK-12 Foundation
itemprop: name
itemprop: description
itemprop: url content: https://flexbooks.ck12.org/flexbooks/student/

Interne lenker

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Eksterne lenker

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Whois informasjon

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domain_name: ck12.org

update_date: 2025-08-07T22:10:54.892Z

update_time: 1754604654

creation_date: 2006-12-16T08:37:03.681Z

creation_time: 1166258223

expiration_date: 2028-12-16T08:37:03.681Z

Whois rådata

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            Domain Name: CK12.ORG
Registrar: Amazon Registrar, Inc.
Domain Status: client delete prohibited
Domain Status: client transfer prohibited
Domain Status: client update prohibited
Registry Expiry Date: 2028-12-16T08:37:03.681Z
Creation Date: 2006-12-16T08:37:03.681Z
Updated Date: 2025-08-07T22:10:54.892Z
Name Server: NS-1136.AWSDNS-14.ORG
Name Server: NS-161.AWSDNS-20.COM
Name Server: NS-1687.AWSDNS-18.CO.UK
Name Server: NS-977.AWSDNS-58.NET
REGISTRAR Contact: Amazon Registrar, Inc.
>>> Last update of RDAP database: 2026-02-16T21:03:58Z

SEO revisjon

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Teknisk SEO

✓

Responskode

200

Status 200 OK - siden lastes inn riktig.

✓

Tegnkoding

Page: utf-8, Header: utf-8

Tegnkoding konsistent mellom HTML og overskrifter.

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Sidestørrelse

303246 bytes

Sidestørrelse akseptabel for rask lasting.

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Ressurser

109 total

For mange ressurser. Optimaliser og kombiner filer for bedre ytelse.

✓

Hreflang Tags

0 hreflang tags

Legg til hreflang-tagger hvis du har flerspråklig innhold.

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Robots.txt

Missing

Legg til robots.txt-fil for å kontrollere gjennomsøking av søkemotorer.

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Sitemap

Not found

Legg til sitemap.xml og referer til det i robots.txt.

✓

HTTPS

Yes

Sikker HTTPS-tilkobling aktivert.

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Komprimering

gzip

Gzip eller Zstd-komprimering aktivert for raskere lasting.

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Buffer

Not set

Legg til cache-kontrolloverskrifter for å forbedre lastehastigheten for tilbakevendende besøkende.

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Sidehastighet

2.64 ms

Utmerket lastehastighet.

On-Page SEO

✓

Tittel

K-12 FlexBooks | CK-12 Foundation

God tittellengde (30-60 tegn).

✓

Metabeskrivelse

CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks. Lenght:152

God metabeskrivelseslengde (100-160 tegn).

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H1 Overskrift

2 found - "Interact with Your Math & Science Textbooks in a Whole New Way"

Bruk kun én H1-overskrift per side. Fjern ekstra H1-tagger.

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Ordtelling

202

Innholdet er veldig kort. Sikt på minst 500 ord for bedre SEO.

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Kanonisk merkelapp

Legg til kanonisk tag for å forhindre problemer med duplisert innhold.

✓

Dupliser Meta

[]

Fant ingen dupliserte metakoder.

✓

Nøkkelord

empty

Meta nøkkelord satt (merk: brukes ikke av store søkemotorer).

Innhold og UX

✓

Språk

en

Språkattributtet er riktig angitt.

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Bilder

67 total, 51 missing ALT

Legg til ALT-tekst i bilder for tilgjengelighet og SEO.

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Viewport

width=device-width, initial-scale=1, minimum-scale=1.0

Viewport-metataggen er riktig angitt for mobile enheter.

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Åpne Graph

Missing: og:title, og:image

Legg til manglende OpenGraph-koder for deling av sosiale medier:og:title, og:image

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Strukturerte data

1 JSON-LD scripts

Fant strukturerte data (JSON-LD).

Søkefraser - Google

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Posisjon	Uttrykk	Side	Utdrag
3	k e q	/cbook/ck-12-chemist...	Equilibrium Constant (Keq) The equilibrium constant (Keq ) is the ratio of the mathematical product of the concentrations of the products of a reaction to the mathematical product of the ...
7	write 6 6 3 4	/cbook/ck-12-cbse-ma...	Divisibility Rules for 2, 3, 4, 5, 6, 8, 9, 10 and 11 A number is divisible 6 if it is divisible by both 2 and 3 . Example of divisibility rule for 6 : Consider the number 47394. Since its units digit is 4 , it is ...
9	types of energy	/cbook/cbse-physics-...	Forms of Energy - Defintion, Types, Formula, Examples ... The six forms of energy include mechanical, chemical, electrical, light, thermal, and sound energy . Another form of energy is nuclear energy.
12	science models	/cbook/ck-12-middle-...	Scientific Models Models allow scientists to work with systems that are nearly impossible to study as a whole. Models help scientists to understand these systems.
14	write the time using words	/cbook/ck-12-first-g...	Time Conversion between Words and Numbers We are going to learn how to write down the time in digits (numbers). ... The most common way to express time in words is just to say the time in the form HOUR ...
22	us class us	/user:coachtgj/cbook...	The American Class System Most sociologists use six class divisions when describing the American class system. Because it is an open system, people are able to move between classes.
22	date mark time 40 minutes	/cbook/ck-12-middle-...	Elapsed Time Elapsed time is the amount of time that has passed between two events. You can calculate the elapsed time by figuring out the difference between the start and ...
26	complete a square	/cbook/ck-12-algebra...	Completing the Square When the Leading Coefficient ... Step 1: Write the polynomial so that and are on the left side of the equation and the constants on the right. Step 2: Pull out from everything on the left side.

Tilleggstjenester

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