1. Benchmark Landmarks: The Mental Toolbelt
Any percent can be estimated using friendly landmarks: 10% (shift decimal 1 place left), 1% (shift 2 places), 5% (half of 10%), and 25% (quarter).
Cualquier porcentaje se puede estimar con referencias: 10% (mueve el punto 1 lugar), 1% (2 lugares), 5% (mitad de 10%) y 25% (un cuarto).
2. Mental Math Power Combos
Build tough percents by combining 10% and 5%: 15% = 10% + 5%, 20% = 2 × 10%, 30% = 3 × 10%.
Construye porcentajes combinando 10% y 5%: 15% = 10% + 5%, 20% = 2 × 10%.
3. Compatible Numbers & Rounding
Round messy percents and whole numbers to nearby compatible numbers that work easily with benchmark percents.
Redondea porcentajes y cantidades a números compatibles cercanos.
4. Real-World Tipping, Sales & Error Detective
Apply estimation to restaurant bills, sale discounts, phone storage (Reveal 4-3), and catch common estimation traps.
Aplica la estimación a propinas, descuentos y corrige errores comunes.
5. Estimation Mastery Check
Answer all 10 questions to prove mastery of benchmark percents, compatible numbers, and mental math.
10 preguntas para demostrar dominio de las estimaciones porcentuales.