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Multiples Sudoku

Age 11 to 14
Challenge Level Yellow star
Secondary curriculum
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Multiples Sudoku printable worksheet


By Henry Kwok

Sudoku

Rules of Multiples Sudoku

Like a conventional Sudoku, this Multiples Sudoku has two basic rules:

  • Each column, row, and 3 x 3 subgrid must have the numbers 1 to 9.
  • No column, row, or subgrid can have two cells with the same number.


The puzzle can be solved with the help of  the numbers which are placed on the border lines between selected pairs of neighbouring cells.
These numbers are the product of the two digits in the cells to the left and right of the clue.

For example, where there is a 12 on the line between two neighbouring cells, the cells must contain 2 and 6, or 6 and 2, or 3 and 4, or 4 and 3.


You may be interested in the other problems in our Playful Puzzling Feature.

Related Collections

  • Working Systematically - Lower Secondary

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Adding All Nine

Make a set of numbers that use all the digits from 1 to 9, once and once only. Add them up. The result is divisible by 9. Add each of the digits in the new number. What is their sum? Now try some other possibilities for yourself!

Double Digit

Choose two digits and arrange them to make two double-digit numbers. Now add your double-digit numbers. Now add your single digit numbers. Divide your double-digit answer by your single-digit answer. Try lots of examples. What happens? Can you explain it?

Repeaters

Choose any 3 digits and make a 6 digit number by repeating the 3 digits in the same order (e.g. 594594). Explain why whatever digits you choose the number will always be divisible by 7, 11 and 13.

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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