Quidditch Cup tutorial
To find the answer to an addition or subtraction problem you first identify the operation.
The wizard Blaze has 520 knuts he drops 409 of them. How many knuts does Blaze have left?
This is the operation
Next do the addition or subtraction.
If Ludo Bagman has hit 240 bludgers and then hit 238more how many bludgers has he hit?
Then do the addition.