WAEC - Mathematics (2010 - No. 29)
The subtraction below is in base seven. Find the missing number.
5 1 6 2seven
-2 6 4 4seven
--------
2 * 1 5
--------
5 1 6 2seven
-2 6 4 4seven
--------
2 * 1 5
--------
2
3
4
5
解释
5 1 6 2seven
-2 6 4 4seven
--------
2 2 1 5
--------
the missing number is 2
-2 6 4 4seven
--------
2 2 1 5
--------
the missing number is 2