At the 7puzzle company, we produce number puzzles for our many followers from nearly 140 different countries and territories all over the world. Our aim is to help improve the basic knowledge and confidence of number & arithmetic in a fun way.
Enjoy your visit and spread the message about our fabulous daily number puzzles at 7puzzleblog.com.
Scroll down to try some of our recent challenges which will fully test your general arithmetic skills. There are over 1,000 other number challenges to try on this page if you delve deeply!
You can also follow my tweets at @7puzzle or e-mail me at firstname.lastname@example.org.
Paul Godding: Owner, the 7puzzle company
Follow the rules and eliminate every number, except one, from the following list of fifteen numbers:
12 15 18 20 21 24 28 30 32 35 39 42 45 49 50
Which is the ONLY number left remaining when you eliminate all multiples of 3, 5 and 7?
If you added 3+6, then to that answer added 9, then 12 . . . and kept on adding consecutive multiples of 3 to the previous total, what is the first answer you would reach that is more than 100?
From the following list of eight numbers, which SEVEN will total exactly 100 when added together?
10 11 12 14 15 16 18 20
This number puzzle is something very different and unique. By allocating fifteen letters the following values as seen here:
E=3, F=9, G=6, H=1, I=-4, L=0, N=5, O=-7, R=-6, S=-1, T=2, U=8, V=-3, W=7, X=11
you can make O+N+E=1 and T+W+O=2.
How far can you go before it stops working?
Apart from 9+8+7+3+2+1, there are SEVEN other ways you can make 30 when adding together six UNIQUE digits from 1-9.
Can you find these seven combinations?
Replace the eight gaps below (indicated by ?) with the eight digits 1, 1, 1, 2, 2, 3, 4 and 5 so both lines work out arithmetically:
? + ? = 3 = ? – ?
? + ? = 4 = ? × ?
If you enjoy this type of number puzzle, click this Mathelona link for details of my challenging app.
This is a Countdown-style number puzzle similar to the maths challenges regularly seen on the Channel 4 show in the UK, but in a slightly different way to the show, my site insists you use all six numbers in the calculation.
Using 1, 4, 5, 6, 10 and 100 once each with + – × ÷ available, can you land safely on the target answer 747?
This number trail includes a fraction and percentage calculation, but only seven arithmetical steps.
Start with the number 50, then:
+27 –42 divide by 5 ×4 +50% 1/3 of this ÷7 = ?
What is your final answer?
Follow the rules by eliminating particular types of numbers from a given list . . . but there will be a few left.
From the numbers 1-20, eliminate all:
- square numbers
- prime numbers
- triangular numbers
Add together those numbers that remain. What is your total?