Start with the unit and the scale
Read the unit before choosing numbers. Kilograms and tonnes, kilometres and metres, and percentages and totals are easy to confuse.
Find an anchor you trust. If a quantity is roughly hundreds of thousands, a range in the hundreds is unlikely to help. The public topic examples include explanations of these anchors.
Set two bounds you can defend
Ask what would be surprisingly small and what would be surprisingly large. Those are useful first bounds. Move them inward only when you have a reason.
A range is not a probability statement: Approx checks whether the numerical answer lies between your submitted bounds, including the endpoints. One bound is treated as an exact guess.
Compare precision with safety
Suppose the answer is 26. Sarah submits 20 to 30, Nick submits 10 to 30, and Lucia submits 15 to 25. Sarah and Nick catch the answer; Lucia misses it. Sarah has the narrower correct range.
An illustrative scoreboard might award Sarah 1,000 points and Nick 500. Those figures explain the idea; actual points depend on the configured bonuses, partial-point rules and other answers.
Use power-ups deliberately
Check which power-ups are available and how many uses remain. A digit hint can help you find the scale, while a wrong-range warning can tell you that your estimate needs another look.
A power-up does not replace reading the question. Its effect and permitted uses come from the current game rules.
Learn from the reveal
Compare your bounds with the answer, then open the source if you want to understand it. Notice whether the mistake came from the unit, a memory error or making the range too narrow.
The demo allows retries with higher/lower hints. Competitive rounds follow their own submission and resubmission rules, so do not assume you can keep changing an answer there.