DAY 330:

The Main Challenge

This is a number trail involving ten arithmetical steps. Be careful with your calculations – and no calculators please!

Start with the number 40, then:

  • multiply by 4
  • +10%
  • subtract 15
  • divide by seven
  • add nine
  • 1/2 of this
  • +87
  • double this
  • 96
  • ÷10

What is your final answer?

The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 1st & 4th columns contain the following fourteen numbers:

3   6   13   20   21   22   27   42   55   56   60   63   72   77

What is the product of the highest number and lowest number?

The Factors Challenge

Which is the ONLY number below that is not a factor of 330?

2    3    5    6    9    10    11    15

The Mathematically Possible Challenge

Using 56 and 12 once each, with + – × ÷ available, which FIVE numbers is it possible to make from the list below?

2    3    5    7    11    13    17    19    23    29

#PrimeNumbers

The Target Challenge

Can you arrive at 330 by inserting 3, 5, 10, 11 and 15 into the gaps below?

  •  ◯×◯×(◯–◯–◯) = 330

Answers can be found here.

Click Paul Godding for details of online maths tuition.

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