Basic arithmetic operations and calculations
Find the decimal representation of any fraction and instantly see whether it is a terminating or repeating decimal. Shows…
Write any proper fraction the ancient Egyptian way: as a sum of distinct unit fractions, like 5/8 = 1/2 + 1/8. See the greedy…
Test any number with Luhn validation or find its check digit with the mod 10 algorithm. Works as a credit card number checker…
Turn any interval into set-builder notation and roster form. Choose the number set (integers ℤ, natural ℕ, whole ℕ₀, or real…
Find the total sum of digits in any set of numbers: enter up to 10 whole numbers or a range of consecutive integers and get…
Instantly compute the ceiling of any real number: ⌈x⌉, the smallest integer greater than or equal to x. Enter any positive,…
Instantly compute the floor of any real number: ⌊x⌋, the greatest integer less than or equal to x. Enter any positive, negative,…
Find any triangular number Tₙ = n(n+1)/2, list the sequence, and check whether a number is triangular. Explore row sums,…
Generate a magic square of any order from 3×3 to 10×10 instantly. Choose the starting number and common difference, then…
Calculate the factorial (n!) of any number from 0 to 170 instantly. Shows the exact full-length value, number of digits,…
Check instantly whether any number is prime or composite. Shows the smallest factor, all divisors, the previous and next…
Break any integer or decimal number into a full place value chart: each digit, its place name, its power of 10, the place…
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