Counting coins
The question
Count the money
How it works.
1 ×10¢= 10¢
1 ×1¢= 1¢
1 × 10¢→10¢
1 × 1¢→11¢
1 × 10¢→10¢
1 × 1¢→11¢
11¢
- 01
Sort them BIGGEST first. Counting a pile in whatever order it lands in means holding an awkward running total; starting big keeps every step easy.
- 02
Then count on, one group at a time: 10¢, then 11¢.
- 03
Altogether 11¢.