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Problem
Adding long lists of numbers one at a time is slow and error-prone.
Solution
Look for pairs that sum to 10, group numbers that are easy to add (like 25+75=100).
Benefit
Speeds up mental addition by 50% by reducing the number of operations.
Example
Add: 8 + 14 + 2 + 6 + 25 + 75
Group strategically:
(8 + 2) = 10
(14 + 6) = 20
(25 + 75) = 100
10 + 20 + 100 = 130