Monthly Archives: May 2018

DAY 142:

The Main Challenge From the numbers 1-20, eliminate all: square numbers prime numbers triangular numbers multiples of 6 When adding together the numbers that remain, what is your total? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing … Continue reading

DAY 141:

The Main Challenge One of our easier Mathelona-style challenges, but still utilising the four arithmetic operations.  Place the eight digits 1, 2, 2, 3, 4, 4, 5 and 6 into the gaps so both lines work out: ◯  +  ◯   = … Continue reading

DAY 140:

Today’s Challenge Using the three digits 4, 6 and 9 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below? 7    14    21    28    35    … Continue reading

DAY 139:

Today’s Challenge There are two sections below, both containing ten letters, A-J.  Each letter is linked to a division calculation: Section 1 D:9÷3  H:8÷2  B:12÷3  I:8÷4  A:4÷2  E:24÷6  G:15÷5  C:20÷4  F:25÷5  J:7÷7 Section 2 I:6÷2  G:6÷3  D:10÷2  E:12÷4  J:14÷7  B:20÷5  A:18÷6  C:10÷5 … Continue reading

DAY 138:

Today’s Challenge The two sections below both contain ten letters, A-J; each of which has a multiplication calculation assigned to it: Section 1 C:10×2  J:4×3  F:8×5  D:3×3  I:3×2  G:7×4  B:5×4  H:9×4  E:10×3  A:6×4 Section 2 B:12×2  D:6×1  G:8×3  J:5×2  E:6×5 … Continue reading

DAY 137:

Today’s Challenge It is possible to use seven 5’s (5, 5, 5, 5, 5, 5 and 5) once each, with the four operations + – × ÷, to make all the target numbers from 1 to 5. For instance, to arrive … Continue reading

DAY 136:

Today’s Challenge Can you arrive at the target number 55 by using the five numbers 1, 2, 3, 4 and 5 exactly once each and with + – ×  ÷ available? The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading

DAY 135:

Today’s Challenge Here’s a number trail involving 16 arithmetical steps.  Start with the number 2, then:  +33  divide by seven  ×3  add ten percent  double this  add three  find the square root of this  +7  1/2 of this  add nineteen … Continue reading