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17 December

Arrange the digits 1-9 in a 3×3 square so that every row makes a three-digit square number, the first column makes a multiple of 7 and the second column makes a multiple of 4. The number in the third column is today's number.
square
square
square
multiple of 7multiple of 4today's number
Tags: numbers, grids

16 December

There are 204 squares (of any size) in an 8×8 grid of squares. Today's number is the number of rectangles (of any size) in a 2×19 grid of squares

15 December

The string ABBAABBBBB is 10 characters long, contains only A and B, and contains at least three As.
Today's number is the number of different 10 character strings of As and Bs that have at least three As.

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Tags: numbers

14 December

There are 204 squares (of any size) in an 8×8 grid of squares. Today's number is the number of squares in a 13×13 grid of squares

13 December

A book has 754 pages (numbered 1 to 754: page 1 is on the left of the first double page spread, and page 754 is on the right of the final double page spread). What do the page numbers of the middle two-page spread add up to?
Tags: numbers

12 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. Today's number is the product of the numbers in the red boxes.
++= 17
+ + +
++= 7
+ + +
++= 21
=
11
=
20
=
14
Tags: numbers, grids

11 December

Two more than today's number is the reverse of two times today's number.

10 December

How many zeros does 1000! (ie 1000 × 999 × 998 × ... × 1) end with?

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