In-depth Investigation: Magic Chains
Children use their knowledge of inverse operations to quickly work out a sequence of calculations.
In-depth Investigation: No Zero
Children investigate how many numbers between one and ten thousand have a zero. They use their understanding of place value in numbers with up to 4-digits.
In-depth Investigation: Cats and Dogs
Children work to solve a puzzle involving adding two 3-digit numbers. They find several possible solutions, and then invent their own puzzle.
In-depth Investigation: Palindromic Time Intervals
Children systematically find palindromic digital times and list them in an ordered way. They convert these to analogue times and calculate the intervals between them.
In-depth Investigation: Slow Coach
Calculate time intervals to investigate return journeys on a coach timetable. Slow Coach from nrich.maths.org.