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We couldn’t let 7 December go without a Silver Medal MATHELONA challenge, and utilising the numbers from today’s date. For further details of my app, including a great review, click Mathelona before downloading.

Replace the 16 letters below with digits from 0-9. You must make all four lines work out, but each digit can only be inserted a maximum of TWICE throughout the challenge:

•   A + B    =    12    =    C + D
•   E + F    =     7     =    G – H
•   I + J     =    12    =    K x L
•  M + N   =     7      =    P ÷ R

Have a go on your iPhone by downloading my Mathelona app and see how many medals you can win when playing against the clock.

We end the school week as we started – with a Silver Medal challenge from my MATHELONA app. It has been designed to celebrate today’s date, 6 December. For further details of my app, including a great review, click Mathelona before downloading.

Replace the 16 letters below with digits from 0-9. You must make all four lines work out, but each digit can only be inserted a maximum of TWICE throughout the challenge:

•   A + B    =    12    =    C + D
•   E + F    =     6     =    G – H
•   I + J     =    12    =    K x L
•  M + N   =     6      =    P ÷ R

Have a go on your iPhone by downloading Mathelona and see how many medals you can win when playing against the clock. Let me know if you have solved the above too!

Today sees a challenge relating to money calculations and making use of fractions & percentages, both regularly used in EVERYDAY MATHS. Can you answer this mentally? But please use paper and pen/pencil if need be:

There are five co-owners of a company. Four of them receive one-third, one-quarter, one-fifth and one-sixth of the profits respectively. The fifth owner receives the remainder. If the overall profit for 2013 was £6million, how much would the fifth owner receive? Also, what is his/her percentage share?

Got an answer? E-mail me at paul@7puzzle.com.

Today sees a return of our TARGET 7 challenge where at least one decimal number is always present in the question:

Using each of the numbers 0.4, 1, 1.4 and 4 once each, and with the four arithmetical operations available, can you arrive at the target answer of 7?

Got an answer? E-mail me at paul@7puzzle.com.

Here’s one of our original and favourite puzzles, KAKURO, which is all about number combinations, combined with addition:

Your task is to find the number of ways of making 19 when adding together 3 UNIQUE digits from 1-9. One such combination is 9+8+2 – how many others can you find?

Got an answer? Leave a comment below or e-mail me at paul@7puzzle.com.

Here’s another Silver Medal challenge from my MATHELONA app, especially designed to celebrate the first few days of December! For further details of my app, including a great review, click Mathelona before downloading.

Replace the 16 letters below with digits from 0-9. You must make all four lines work out, but each digit can only be inserted a maximum of TWICE throughout the challenge:

•   A + B    =    12    =    C + D
•   E + F    =     2     =    G – H
•   I + J     =    12    =    K x L
•  M + N   =     2      =    P ÷ R

Have a go on your iPhone by downloading Mathelona and see how many medals you can win when playing against the clock. Let me know if you have solved the above too!

Here’s the second of this weekend’s Silver Medal questions from my MATHELONA app, a specially designed one to celebrate the first day of December! For further details of my app, including a great review, click Mathelona before downloading.

Replace the 16 letters below with digits from 0-9. You must make all four lines work out, but each digit can only be inserted a maximum of TWICE throughout the challenge:

•   A + B    =    12    =    C + D
•   E + F    =     1     =    G – H
•   I + J     =    12    =    K x L
•  M + N   =     1      =    P ÷ R

Have a go on your iPhone by downloading Mathelona and see how many medals you can win when playing against the clock. Let me know if you have solved the above too!

Here’s the first of this weekend’s Silver Medal questions from my MATHELONA app. For further details of this popular app, including a great review from a Y5 class, click Mathelona for a preview before downloading.

Replace the 16 letters below with digits from 0-9. You must make all four lines work out, but each digit can only be inserted a maximum of TWICE throughout the challenge:

•   A + B    =     6     =    C + D
•   E + F    =     4     =    G – H
•   I + J     =    12    =    K x L
•  M + N   =     1     =     P ÷ R

Have a go on your iPhone by downloading Mathelona and see how many medals you can win. Let me know if you have solved the above too!

Here’s a MENTAL MATHS challenge to end the school week. This type of question forms part of a numeracy skills test that teachers-to-be in the UK have to undertake. Try this without using pen/pencil, paper or calculator. You have one minute to complete:

A school’s policy for 10 & 11 year-olds was to set three-and-a half hours of homework per week. What was the average (mean) number of minutes to be spent on homework per weekday evening?

Let us know your answer by leaving a comment below.

Here’s another MENTAL MATHS challenge that forms part of a numeracy skills test that teachers-to-be in the UK have to undertake. This time, the school-related number puzzle involves percentages. Try it in your head – without pen/pencil, paper, calculator – to complete in less than one minute:

In a year group of 120 pupils, 75% achieved at Level 4 or Level 5 in Key Stage 2 Maths. If sixty-five pupils achieved Level 4, how many pupils achieved Level 5 standard?

Have you an answer? Leave a comment below.