Question 1
Number BasesFind x and y respectively in the subtraction below carried out in base 5.
4 2 4 3
− 1 3 x 4
= y 3 4 4
- A.2, 4
- B.3, 2
- C.4, 2
- D.4, 3
Show the answer and explanation
Answer: C (4, 2)
Explanation
Units: borrow, 8 − 4 = 4. Fives: 3 − x needs a borrow, 8 − x = 4, so x = 4. Twenty-fives: 6 − 3 = 3. Hundred-and-twenty-fives: 4 − 1 − 1 = 2, so y = 2.