Adding two numbers in standard form

Maths

1. Work out (2.7 × 10⁶) + (7.3 × 10⁶). Give your answer in standard form.

2. Calculate (4 × 10³) + (4 × 10⁴), give your answer in standard form.

3. Work out (3 × 10⁴) + (4 × 10⁵), give your answer in standard form.

4. Calculate (4.1 × 10⁶) + (3.2 × 10⁵), giving your answer in standard form.

5. Work out (5 × 10¹) + (5 × 10⁻¹), giving your answer in standard form.

Which number is smaller? 5 x 10⁻⁴ or 4 x 10⁻⁵