# 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

## DAY 134:

Today’s Challenge Read the following facts to work out my numerical value: I am a single digit number, If you add 6 to me I become a 2-digit number, I am an odd number, I am not a square number, I … Continue reading

## DAY 133:

Today’s Challenge Group these ten numbers into five pairs so that the difference between the two numbers in each pair is exactly divisible by seven: 6 17 28 37 45 58 64 78 … Continue reading