1. 80/8 80 in 880 questions · 8:00 · Optiver-style478 + 356 · 3.4 × 2.5 · 12% of 850 · (160 − 17) ÷ 11
2. Seq Number sequences30 questions · 4:003, 7, 15, 31 → 63 · 2, 37, 8, 51, 14 → 65
3. Frac Fractions60 questions · 4:007/16 = 0.4375 · Eighths in 0.375 = 3 · 3/8 in % = 37.5
4. Est Estimation40 questions · 4:00 · within 5%48.7 × 21.3 ≈ 1,040 · √5,200 ≈ 72 · 17.5% of 6,320

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Estimation: 1037 and 1,040 are both fine for 48.7 × 21.3.