Being Playful with Numbers - Secondary
Got It
A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.
Summing Consecutive Numbers
15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?
Missing Multipliers
What is the smallest number of answers you need to reveal in order to work out the missing headers?
Factors and Multiples Game
A game in which players take it in turns to choose a number. Can you block your opponent?
Product Sudoku
The clues for this Sudoku are the product of the numbers in adjacent squares.
American Billions
Play the divisibility game to create numbers in which the first two digits make a number divisible by 2, the first three digits make a number divisible by 3...
Generating Triples
Sets of integers like 3, 4, 5 are called Pythagorean Triples, because they could be the lengths of the sides of a right-angled triangle. Can you find any more?
Divisibility Tests
This article explains various divisibility rules and why they work. An article to read with pencil and paper handy.