Question

It's very easy question
I hope you know this answer
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Answer 1

Step-by-step explanation:

$2 \times 3 = 6 \\ 3 \times 4 = 12 \\ 4 \times 5 = 20 \\ 5 \times 6 = 30 \\ 6 \times 7 = 42 \\ . \\ . \\ 9 \times 10 = 90$

Answer 2

90

Step-by-step explanation:

2×3=6

3×4=12

4×5=20

5×6=30

6×7=42

7×8=56

8×9=72

So , It is very simple

9×10=90