What approximate value should come in place of the question mark (?) in the following equation? (You are not expected to calculate the exact value.) √1300 + √2700 + √1025 + √2025 + √440 + √840 = ?

Which of the following is the closest approximation to the product of 0.2222 × 0.16 × 0.399 × 0.115 × 20?

What approximate value should come in place of the question mark (?) in the following expression? (Note: You are not expected to calculate the exact value.)3199.98 ÷ 79.99 × 45.02 = ? + 124.97