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