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RASEA23
An easy way to do this mentally is split up the numbers:
90 x 4
9 x 10 x 4
9 x 4 x 10
36 x 10
360

Hope this helps :)
bookishfairy73
1.Calculate 0 x 4, which is 0.

2 Calculate 9 x 4, which is 36.Since 36 is two-digit, we carry the first digit 3 to the next column.


3 Bring down the carry digit of 3.

4 Therefore, 90 x 4 = 360.