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Guides

Short, clear guides that explain the maths behind dates, time and percentages, with worked examples and links to the right calculator.

Guides about Guides

Flat illustration of a computer keyboard with a speedometer gauge showing faster typing speed. October 27, 2026 · 8 min read

How to Improve Your Typing Speed (WPM)

Learn how to improve your typing speed with home-row technique, accuracy drills, and a 2-week practice plan. Real WPM…

 Flat illustration of a die, colorful lottery balls numbered 7, 12, 23 and 45, and a raffle ticket, under the words "FAIR RANDOM NUMBERS" October 27, 2026 · 10 min read

How to Generate Random Numbers Fairly

Learn how to generate random numbers fairly: the range formula, worked examples, no-repeat draws, and the mistakes that…

 Examples of the same sentence written in title case, sentence case, camelCase, snake_case and kebab-case. October 26, 2026 · 9 min read

How to Change Text Case: Title Case, Sentence Case, camelCase, snake_case

Learn how to change text case: title case, sentence case, camelCase, snake_case and kebab-case, with rules, examples…

 Binary code chart showing the letters H and i converted to 01001000 01101001 October 26, 2026 · 10 min read

How to Convert Text to Binary and Hex: A Step-by-Step Guide with Worked Examples

Learn how to convert text to binary and hex by hand: place values, ASCII codes, UTF-8 examples and worked conversions…

 Educational graphic titled "HOW TO WRITE NUMBERS IN WORDS" showing a sample check with the amount 1,250.75 written as "One thousand two hundred fifty and 75/100 dollars" beside large number examples like twenty-one and one million. October 25, 2026 · 8 min read

How to Write Numbers in Words: Checks, Money and Large Numbers

Learn how to write numbers in words: hyphen rules, money amounts, check-writing steps, decimals and large numbers —…

 Clean educational graphic titled "HOW TO COUNT WORDS AND CHARACTERS" showing a sample sentence with its word count, character count with spaces, and character count without spaces highlighted in three labeled boxes. October 25, 2026 · 12 min read

How to Count Words and Characters: A Complete Guide

Learn how to count words and characters: what counts as a word, characters with and without spaces, worked examples…

 Flat illustration of a wall calendar with the date circled in red and a large "TODAY" badge, surrounded by weekday labels, on a teal background. October 24, 2026 · 8 min read

What Day Is It Today? How to Find the Date and Day of the Week

Find today's date and day of the week, learn to read any date format, compute weekdays by hand, and understand ISO week…

 Colorful educational chart graphic titled "HOW TO READ ROMAN NUMERALS" showing the seven symbols I=1, V=5, X=10, L=50, C=100, D=500, M=1000 with arrow examples IV=4, IX=9, and XIV=14. October 24, 2026 · 7 min read

How to Read Roman Numerals: A Complete Guide with Worked Examples

Learn how to read Roman numerals with the 7 symbols, the subtraction rule, and worked examples: XIV = 14, XCIX = 99…

 Flat-vector infographic showing a clock face with large text "HOURS + MINUTES", arithmetic examples 2h 45m + 3h 30m = 6h 15m with a 60-minute carry arrow, blue and orange design October 23, 2026 · 7 min read

How to Add and Subtract Hours and Minutes: Step-by-Step Guide

Learn how to add and subtract hours and minutes: carry 60 minutes as 1 hour, borrow for subtraction, cross midnight —…

 Flat-vector staircase graphic titled "PEMDAS ORDER OF OPERATIONS" with five descending steps labeled P Parentheses, E Exponents, M Multiplication, D Division, A Addition, S Subtraction, showing the worked example 8 + 2 × 5 = 18. October 23, 2026 · 10 min read

How to Use PEMDAS: Order of Operations Explained

Learn PEMDAS order of operations with worked examples: parentheses, exponents, multiplication, division, addition…

 Flat-vector infographic with a clock in the center showing "1 hour = 60 minutes = 3,600 seconds," an hourglass card on the left, a stopwatch card on the right, and ×60 conversion arrows linking hour, minute, and second cards October 22, 2026 · 8 min read

How to Convert Time Units: Hours, Minutes & Seconds Explained

Learn how to convert time units with simple multiply-and-divide rules, a conversion table, and worked examples for…

 Flat-vector illustration titled "3:2 PROPORTION": a balance scale holding three blue circles on the left pan and two orange circles on the right, captioned "3 blue circles • 2 orange circles — Equal Balance — 3 Parts : 2 Parts" October 22, 2026 · 9 min read

How to Calculate Proportion: Cross-Multiplication with Examples

Learn how to calculate proportions with cross-multiplication: step-by-step examples of direct and inverse proportions…