Which benchmark estimates are reasonable? Select all that apply.

Explanation

Rounding gives 6.1 + 2.2 near 6 + 2 = 8, 9.8 × 0.21 near 10 × 0.2 = 2, and 14.9 - 4.8 near 15 - 5 = 10. Estimating 3.9 × 0.8 as 32 ignores the decimal scale; 4 × 0.8 is near 3.2 instead.