Monthly Archives: September 2017

DAY 274:

Today’s Challenge Your task is to arrive at the target answer of 7 by placing the numbers 1, 1.5, 2 and 3 into the gaps on each line:  (◯×◯)+◯+◯ = 7  (◯+◯–◯)×◯ = 7  [◯÷(◯–◯)]+◯ = 7 The 7puzzle Challenge The playing … Continue reading

DAY 273:

Today’s Challenge Starting with the number 70, keep on subtracting consecutive prime numbers from the previous total (2, 3, 5, …) until your answer becomes negative. What is this number? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 … Continue reading

DAY 272:

Today’s Challenge This 10-step number trail, involving the four arithmetical operations, may leave you in sixes and sevens! Start with the number 6, then: add 7 –6 multiply by 6 +7 divide by 7 subtract 6 +6 ÷7 add 6 –7 … Continue reading

DAY 271:

Today’s Challenge If you write out all numbers from 1-100, what is the longest run of consecutive numbers that are not prime numbers?  What is the lowest and highest numbers in that run? The 7puzzle Challenge The playing board of the 7puzzle … Continue reading

DAY 270:

Today’s Challenge Here’s a crafty MATHELONA challenge where your task is to make all three lines work out arithmetically by replacing the 12 ◯’s with digits from 0 to 5, each digit being inserted exactly twice: ◯  +  ◯   =    0   … Continue reading

DAY 269:

Today’s Challenge There is just one set of three consecutive numbers in ascending order whose sum is less than 50 and follow this sequence:  square number – triangular number – prime number Can you list this set of three numbers? … Continue reading

DAY 268:

Today’s Challenge Find the total of the seven different numbers in the range 65 to 85 that are either multiples of 9, 10, 11 or 12. The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, … Continue reading

DAY 267:

Today’s Challenge The playing board of Even More Possible, our exciting arithmetic & strategy board game, contains 30 even numbers from 2 up to 60. Using all four numbers 1, 5, 5 and 10 once each, and with + – × ÷ available, which even … Continue reading