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

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

Archive

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