Identify Numbers: Identify the numbers to be multiplied, which are 90 and 40.
Multiply Tens Digit: Multiply the tens digit of the first number by the second number. Since 90 is the same as 9 tens, multiply 9 by 40. 9×40=360
Account for Tens Place: Since we originally multiplied 9 tens by 40, we need to account for the tens place by adding a zero to our result from Step 2.360×10=3600
Conclude Product: Conclude that the product of 90 and 40 is 3600.