Interesting Maths Patterns

Look at this interesting number pattern! Use the internet (with supervision from an adult) to find more interesting  number patterns. What happens if you continue this similar pattern? Use a calculator to help:

1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987

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If you find any interesting number patterns post them in the comments below. There will be merits awarded to any good contributions.