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December 24, 2025 was a
Wednesday
How to solve:
December 24, 2025
1
Century anchor
2000s
→
Tuesday (2)
Practice →
2
Divide by 12
25 ÷ 12
→
2
Practice →
3
Remainder of 12
25 % 12
→
1
Practice →
4
Divide remainder by 4
1 ÷ 4
→
0
Practice →
5
Year's doomsday
(2 + 2 + 1 + 0) % 7
→
5 → Friday
Practice →
6
Month doomsday
December
→
12th
Practice →
7
Distance
24 − 12
→
12
Practice →
8
Final answer
(5 + 12) % 7
→
3 → Wednesday
Practice the Doomsday algorithm →