1 out of 3
Zias have 3 legs and Zepts have 7 legs. If there were 52 legs, how many of each were there?
1 out of 3
You have been given nine weights, one of which is slightly heavier than the rest. Can you work out which weight is heavier in just two weighings of the balance?
Alf describes how the Gattegno chart helped a class of 7-9 year olds gain an awareness of place value and of the inverse relationship between multiplication and division.
2 out of 3
What is special about the difference between squares of numbers adjacent to multiples of three?
2 out of 3
Ram divided 15 pennies among four small bags. He could then pay any sum of money from 1p to 15p without opening any bag. How many pennies did Ram put in each bag?
1 out of 3
Take any whole number between 1 and 999, add the squares of the digits to get a new number. Use a spreadsheet to investigate this sequence.
This article explores the process of making and testing hypotheses.
This article takes a closer look at some of the toys and games that can enhance a child's mathematical learning.
2 out of 3
Explore the meaning of the scalar and vector cross products and see how the two are related.
