### There are 14 results

Broad Topics >

Calculations and Numerical Methods > Number operations - generally

##### Age 11 to 14 Challenge Level:

Here are three 'tricks' to amaze your friends. But the really
clever trick is explaining to them why these 'tricks' are maths not
magic. Like all good magicians, you should practice by trying. . . .

##### Age 11 to 14 Challenge Level:

This jar used to hold perfumed oil. It contained enough oil to fill
granid silver bottles. Each bottle held enough to fill ozvik golden
goblets and each goblet held enough to fill vaswik crystal. . . .

##### Age 11 to 14 Challenge Level:

Think of a number, add one, double it, take away 3, add the number
you first thought of, add 7, divide by 3 and take away the number
you first thought of. You should now be left with 2. How do I. . . .

##### Age 11 to 14 Challenge Level:

Replace the letters with numbers to make the addition work out
correctly. R E A D + T H I S = P A G E

##### Age 11 to 14 Challenge Level:

Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?

##### Age 11 to 14 Challenge Level:

Choose any four consecutive even numbers. Multiply the two middle
numbers together. Multiply the first and last numbers. Now subtract
your second answer from the first. Try it with your own. . . .

##### Age 11 to 14 Challenge Level:

Make a set of numbers that use all the digits from 1 to 9, once and
once only. Add them up. The result is divisible by 9. Add each of
the digits in the new number. What is their sum? Now try some. . . .

##### Age 5 to 14

If you would like a new CD you would probably go into a shop and buy one using coins or notes. (You might need to do a bit of saving first!) However, this way of paying for the things you want did. . . .

##### Age 11 to 14 Challenge Level:

Can you arrange these numbers into 7 subsets, each of three
numbers, so that when the numbers in each are added together, they
make seven consecutive numbers?

##### Age 5 to 14

A brief article written for pupils about mathematical symbols.

##### Age 11 to 14 Challenge Level:

Choose two digits and arrange them to make two double-digit
numbers. Now add your double-digit numbers. Now add your single
digit numbers. Divide your double-digit answer by your single-digit
answer. . . .

##### Age 11 to 14 Challenge Level:

Take any four digit number. Move the first digit to the end and move the rest along. Now add your two numbers. Did you get a multiple of 11?

##### Age 11 to 16 Challenge Level:

This Sudoku requires you to do some working backwards before working forwards.

##### Age 5 to 14

Read this article to find out the mathematical method for working out what day of the week each particular date fell on back as far as 1700.