Approximate to sqrt(144) + 8. This becomes 12 + 8 = 20.

Approximate to 80% of 50. Calculation: (80/100) * 50 = 40.

Approximate to 60% of 150. Calculation: (60/100) * 150 = 90.

Approximate to 12.5% of 800. 12.5% is 1/8, so (1/8) * 800 = 100.

Approximate to 40% of 300 - 20. 40% of 300 is 120. Subtraction: 120 - 20 = 100.

Approximate to 75% of 160. 75% is 3/4, so (3/4) * 160 = 120.

Approximate to 10% of 500 + 10. First calculate percentage: 50. Then add 10: 50 + 10 = 60.

Approximate to 50% of 240. 50% is half, so 240 / 2 = 120.

Approximate to 33.33% (or 1/3) of 90. Calculation: (1/3) * 90 = 30.

Approximate to 25% of 120. 25% is 1/4, so 120 / 4 = 30.