The pattern behind the list
Look at the last digit of each answer. From 21 × 1 to 21 × 10 it goes like this, and then the same pattern repeats every ten facts all the way up to 21 × 25:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 0
Working out big facts
You do not need to learn all 25 facts by heart. Use the method for the 21 times table instead: Split 21 into 20 and 1: work out the 20s and the 1s, then add them.
Split 21 into 20 and 1. 20 × 25 = 500 and 1 × 25 = 25, so 21 × 25 = 500 + 25 = 525.
21 × 25 = 500 + 25 = 525