AI Summary
This technique article teaches estimation. If you multiply a 2-digit number by a 1-digit number, the result is likely 2 or 3 digits. This helps you determine where the equals sign might be (e.g., towards the end or middle).
AI Highlights
- Magnitude Check: Is it in the 10s, 100s, or single digits?
- The "=" Anchor: Finding the equals sign placement cuts the search space in half.
Where is the Equal Sign?
If the result is 3 digits, the equals sign is likely at spot 6 or 7. If it's 1 digit, it's at spot 4 or 5.
Rounding for Speed
Treat 19 as 20. Treat 48 as 50. It makes mental math much faster.
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