Copyright © University of Cambridge. All rights reserved.
'Sums and Differences 1' printed from https://nrich.maths.org/
Begin by finding the sum and difference of the numbers you have chosen.
Then think carefully about other pairs of numbers with the same sum. Can you find a pair which also has the same difference?
It might be helpful to record your findings in a table like this:
1st number |
2nd number |
Sum |
Same? |
Difference |
Same? |
24 |
31 |
55 |
|
7 |
|
15 |
40 |
55 |
Yes |
25 |
No, too high |
|
|
|
|
|
|
|
|
|
|
|
|