Investigate how you can work out what day of the week your birthday will be on next year, and the year after...
Many numbers can be expressed as the sum of two or more consecutive integers. For example, 15=7+8 and 10=1+2+3+4. Can you say which numbers can be expressed in this way?
Arrange the numbers 1 to 16 into a 4 by 4 array. Choose a number.
Cross out the numbers on the same row and column. Repeat this
process. Add up you four numbers. Why do they always add up to 34?
A job needs three men to work for two weeks ($10$ working
Andy works for all $10$ days.
Bert works for the first week and Clive works for the second
Dave works for $6$ days, but then is too sick to work.
Eddy takes his place for $3$ days, then Fred does the last day.
When the job is finished they are all paid the same amount. At
first they could not work out how much each man should have, but
then Fred says:
"If I give my wages to Andy, and Eddy gives £$100$ to
both Dave and me, then the wages will be correct".
How much was paid for the whole job, and how much does each man