The pattern behind the list
Look at the last digit of each answer. From 17 × 1 to 17 × 10 it goes like this, and then the same pattern repeats every ten facts all the way up to 17 × 15:
- 7
- 4
- 1
- 8
- 5
- 2
- 9
- 6
- 3
- 0
Working out big facts
You do not need to learn all 15 facts by heart. Use the method for the 17 times table instead: Split 17 into 10 and 7: work out the 10s and the 7s, then add them.
Split 17 into 10 and 7. 10 × 15 = 150 and 7 × 15 = 105, so 17 × 15 = 150 + 105 = 255.
17 × 15 = 150 + 105 = 255