49,000 or 50,000? Rounding to Significant Figures

48,736 fans in the stadium. The radio says 49,000, the newspaper 50,000, the website 48,700. Who is right? All of them: each kept a different number of significant figures. Learn to round to significant figures in four steps: start at the first non-zero digit, count, let the next digit decide, and keep the size of the number. With small numbers, carries, and why significant figures beat decimal places for tiny values. Timestamps (measured on the final): 0:00 — The stadium 0:49 — Counting from the first non-zero digit 1:23 — The method 2:06 — Three roundings of the same number 2:49 — Small numbers 3:23 — When a nine carries 3:47 — Decimal places or significant figures? 4:36 — Your turn 4:49 — The answer 5:15 — Let's Remember! 🎓 Free interactive lesson: https://commeunjeu.org/cours/ib-myp-2... ▶️ The whole series “Approximation”:    • Approximation   🎵 Music: "Ever Mindful" by Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 http://creativecommons.org/licenses/b...