### There are 10 results

Broad Topics >

Calculations and Numerical Methods > Multiplication & division

##### Age 16 to 18 Challenge Level:

Evaluate these powers of 67. What do you notice? Can you convince
someone what the answer would be to (a million sixes followed by a
7) squared?

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

These pictures and answers leave the viewer with the problem "What
is the Question". Can you give the question and how the answer
follows?

##### Age 14 to 16 Challenge Level:

Can you convince me of each of the following: If a square number is
multiplied by a square number the product is ALWAYS a square
number...

##### Age 14 to 16 Challenge Level:

What is the largest number which, when divided into 1905, 2587,
3951, 7020 and 8725 in turn, leaves the same remainder each time?

##### Age 14 to 16 Challenge Level:

What is the units digit for the number 123^(456) ?

##### Age 14 to 16 Challenge Level:

How many zeros are there at the end of the number which is the
product of first hundred positive integers?

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

Using the digits 1, 2, 3, 4, 5, 6, 7 and 8, mulitply a two two digit numbers are multiplied to give a four digit number, so that the expression is correct. How many different solutions can you find?

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

This Sudoku puzzle can be solved with the help of small clue-numbers on the border lines between pairs of neighbouring squares of the grid.

##### Age 14 to 16 Challenge Level:

Can you explain how Galley Division works?

##### Age 14 to 16 Challenge Level:

Vedic Sutra is one of many ancient Indian sutras which involves a
cross subtraction method. Can you give a good explanation of WHY it
works?