Calculate 243six s i x – 243five f i v e expressing your answer in base 10.

Question 1 Report

Calculate 243 $_{s i x}$ – 243 $_{f i v e}$ expressing your answer in base 10.

Answer Details

Since they are of different base, convert to base 10
243 $_{s i x}$ = (2 x 62) + (4 x 61) + (3 x 60)
= 72 + 24 + 3 = 99 base 10
243 $_{s i x}$ = 2 x 52 + 4 x 51 +3 x 50
50 + 20 + 3 = 73 base 10
Subtracting them, 99 - 73
= 26

Read lesson note on Number Bases (WAEC)

Number Bases

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