mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2016

6 December

When you add up the digits of a number, the result is called the digital sum.
How many different digital sums do the numbers from 1 to 1091 have?*
* There was a mistake in this question (it previously said 1092). If you answered the typo'd question right, your answer should automatically correct itself to 9 less than it was...

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021

Advent calendar 2020


List of all puzzles

Tags

cryptic crossnumbers crossnumber partitions area sums cryptic clues doubling palindromes indices graphs addition hexagons median triangle numbers digits pascal's triangle scales cubics quadratics angles cube numbers logic multiplication functions games surds the only crossnumber integers geometric means percentages shape balancing tiling combinatorics 2d shapes means digital products wordplay factors numbers odd numbers expansions factorials people maths matrices clocks cards pentagons 3d shapes planes triangles star numbers advent routes integration range mean complex numbers regular shapes circles money rugby consecutive integers chess dice number geometric mean sequences albgebra crossnumbers prime numbers square roots bases books dominos quadrilaterals coins spheres calculus probabilty christmas ellipses algebra probability polynomials differentiation grids proportion rectangles dodecagons folding tube maps crosswords averages speed parabolas shapes trigonometry coordinates determinants gerrymandering division square numbers consecutive numbers elections tournaments perfect numbers even numbers volume remainders symmetry sport menace geometry fractions products polygons dates time digital clocks floors multiples squares perimeter ave sets decahedra tangents unit fractions arrows taxicab geometry sum to infinity chalkdust crossnumber axes binary irreducible numbers chocolate colouring lines

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2024