1 Twice in 10s column 3 8 Through trial and error we worked out that the top left would be 2 2 1 21 + 38 + 23 + 18 = 100 8 3 We soon realised that by switching the top right and bottom left numbers we would have the same 4 2 digit numbers in our boxes, giving the same answer. 2 3 1 8 Using the same method and thought processes, we tried 7 in the bottom right hand corner. Twice in 10s Ten and a Unit column 7 Ten and a unit 2 lots of 7 are 14 so the other digits in the units column needed to add to 6. It couldn’t be 3 + 3 as you can’t use the same digit twice. We tried 4 and 2. 2 in 10s column 4 7
Twice in 10s column 1 3 8 Through trial and error we worked out that the top left would be 2 2 1 3 8 21 + 38 + 23 + 18 = 100 We soon realised that by switching the top right and bottom left numbers we would have the same 4 2 digit numbers in our boxes, giving the same answer. 2 3 1 8 Using the same method and thought processes, we tried 7 in the bottom right hand corner. Twice in 10s column Ten and a Unit Ten and a unit 7 2 lots of 7 are 14 so the other digits in the units column needed to add to 6. It couldn’t be 3 + 3 as you can’t use the same digit twice. We tried 4 and 2. in 10s column 2 4 7
Y5-nrich%20solution.docx