# Resources tagged with: Modular arithmetic

### There are 15 results

Broad Topics >

Properties of Numbers > Modular arithmetic

##### Age 11 to 16

Challenge Level

Time for a little mathemagic! Choose any five cards from a pack and show four of them to your partner. How can they work out the fifth?

##### Age 11 to 16

Challenge Level

Caroline and James pick sets of five numbers. Charlie chooses three of them that add together to make a multiple of three. Can they stop him?

##### Age 11 to 14

Challenge Level

What is the remainder when 2^{164}is divided by 7?

##### Age 11 to 14

Challenge Level

Mathematicians are always looking for efficient methods for solving problems. How efficient can you be?

##### Age 7 to 11

Challenge Level

Here are many ideas for you to investigate - all linked with the
number 2000.

##### Age 11 to 14

Challenge Level

Explain why the arithmetic sequence 1, 14, 27, 40, ... contains many terms of the form 222...2 where only the digit 2 appears.

##### Age 11 to 14

Challenge Level

Charlie and Abi put a counter on 42. They wondered if they could visit all the other numbers on their 1-100 board, moving the counter using just these two operations: x2 and -5. What do you think?

##### Age 11 to 14

Challenge Level

How many pairs of numbers can you find that add up to a multiple of 11? Do you notice anything interesting about your results?

##### Age 11 to 14

Challenge Level

Imagine we have four bags containing a large number of 1s, 4s, 7s and 10s. What numbers can we make?

##### Age 11 to 14

Challenge Level

Imagine we have four bags containing numbers from a sequence. What numbers can we make now?

##### Age 11 to 14

Challenge Level

A country has decided to have just two different coins, 3z and 5z
coins. Which totals can be made? Is there a largest total that
cannot be made? How do you know?

##### Age 11 to 14

Challenge Level

Investigate how you can work out what day of the week your birthday will be on next year, and the year after...

##### Age 11 to 14

Challenge Level

Can you guarantee that, for any three numbers you choose, the
product of their differences will always be an even number?

##### Age 11 to 18

A Latin square of order n is an array of n symbols in which each symbol occurs exactly once in each row and exactly once in each column.

##### Age 11 to 14

Challenge Level

Where will the point stop after it has turned through 30 000
degrees? I took out my calculator and typed 30 000 ÷ 360. How
did this help?