mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Archive

Show me a random puzzle
 Most recent collections 

Tags

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

Archive

Show me a random puzzle
▼ show ▼

Multiple sums

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.

Show answer & extension

Tags: numbers
If you enjoyed this puzzle, check out Sunday Afternoon Maths IX,
puzzles about numbers, or a random puzzle.
© Matthew Scroggs 2019