Maths problem solving -multiplication

This term for maths Room 19 has been doing Multiplication here is one of my problems.

The 55 children who attended Wainui Camp paid $125.00 each. How much money did Wendy have to pay Wainui Camp.

I used the place value strategy:

55 x 125 = ?

55 x 100 ➝ 5500

55 x 20 ➝ 1100

55 x 5 ➝ 275

5500 + 1100 ➝ 6600 + 275 = 6875

I also used rounding and compensation:

55 x 150

I know, 55 x 100 ➝ 5500

55 x 50 ➝ 2750

5500 + 2750 = 8250

8250 - 1375 = 6875