### More Mods

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

### Expenses

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

### Factorial

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

# Galley Division

##### Age 14 to 16Challenge Level

 $15$ goes into $47$ three times $3 \times 1 = 3$ $4 - 3 = 1$ $3 \times 5 = 15$ $17 - 15 = 2$ Write $15$ again $15$ goes into 23 once $1 \times 1 = 1$ $2 - 1 =1$ $1 \times 5 = 5$ $13 - 5 =8$

... and so on until:

$47324 \div 15 = 3154$ rem $14$