You should use a calculator for the following questions:
1. What is the square root of 169?
2. What is the square root of 441?
3. What is 25 squared?
4. What is 60% of 1280?
5. In each class in a school there are 15 boys and 10 girls. There are 165 boys in the school. How many girls are in the school?
6. A football team has 11 players. In a football tournament, 264 players were involved. How many teams were there?
7. Bill buys 15 sweets, which cost 5 pence each. How much change does he receive from a £1 coin?