mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

23 December

Arrange the digits 1-9 in a 3×3 square so the 3-digits numbers formed in the rows and columns are the types of numbers given at the ends of the rows and columns. The number in the first column is today's number.
a multiple of 4
a cube
a multiple of 3
today's numbera cubean odd number

Show answer

Tags: numbers, grids

21 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the smallest number you can make with the digits in the red boxes.
+-= 7
÷ - ÷
+÷= 8
× × ×
+-= 7
=
12
=
5
=
28

Show answer

Tags: numbers, grids

16 December

Arrange the digits 1-9 in a 3×3 square so that: the median number in the first row is 6; the median number in the second row is 3; the mean of the numbers in the third row is 4; the mean of the numbers in the second column is 7; the range of the numbers in the third column is 2, The 3-digit number in the first column is today's number.
median 6
median 3
mean 4
today's numbermean 7range 2

Show answer

11 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the product of the red digits.
+÷= 2
+ ÷ ÷
÷÷= 3
÷ - ÷
÷÷= 1
=
2
=
1
=
1

Show answer

Tags: grids, numbers

9 December

Arrange the digits 1-9 in a 3×3 square so that: all the digits in the first row are odd; all the digits in the second row are even; all the digits in the third row are multiples of 3; all the digits in the second column are (strictly) greater than 6; all the digits in the third column are non-prime. The number in the first column is today's number.
all odd
all even
all multiples of 3
today's numberall >6all non-prime

Show answer

Tags: numbers, grids

3 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the largest number you can make with the digits in the red boxes.
++= 21
+ × ×
++= 10
+ ÷ ×
++= 14
=
21
=
10
=
14

Show answer

Tags: numbers, grids

21 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the smallest number you can make using the digits in the red boxes.
+÷= 2
× + -
×-= 31
+ + -
-×= 42
=
37
=
13
=
-2

Show answer

Tags: numbers, grids

16 December

Arrange the digits 1-9 in a 3×3 square so that the first row makes a triangle number, the second row's digits are all even, the third row's digits are all odd; the first column makes a square number, and the second column makes a cube number. The number in the third column is today's number.
triangle
all digits even
all digits odd
squarecubetoday's number

Show answer

Tags: numbers, grids

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020