This document discusses different methods for calculating percentages by dividing quantities into equal parts. It explains that 1% is equivalent to dividing by 100, 10% is equivalent to dividing by 10, and 25% is equivalent to dividing by 4. It then provides examples of calculating 10%, 1%, 5%, and other percentages of various quantities through division. Finally, it poses calculation problems using percentages to be solved without a calculator.

1. Find 1%, divide something into 100 equal parts
÷100

2. Find 10%, divide something into 10 equal parts
÷10

3. Find 25%, divide something into 4 equal parts
÷4
What other percentages do you know that are equivalent to a fraction?

4. Find 10% of all of these quantities!
4 388
438.8
43.88
4.388
0.4388
5675
567.5
56.75
5.675
438.8
43.88
4.388
0.4388
0.04388
567.5
56.75
5.675
0.5675
÷10
Team1 Team2

5. Find 1% of all of these quantities!
4 388
438.8
43.88
4.388
0.4388
5675
567.5
56.75
5.675
43.88
4.3880.4388
0.04388
0.05675
56.75 5.675
0.5675
0.004388
÷100

6. Find 5% of all of these quantities!
240
480
5 900
6000
2200
1350
8800
90 000
1 million
÷10 and half it

7. Use 10%, 5%, 1%, 25%, 50% and 20% mental methods to find:
1) 36% of 160€
2) 89% of 80€
3) 26% of 120€

8. Working in Pairs, no calculator allowed. Who can finish first? (It's finding the quickest method/strategy
that is keypoint here!).

9. Find 1% of all of these quantities!

10. Find 1% of all of these quantities!