Remove the decimals and multiply the numbers together.
15 \u00D7 225 = 3,375
When multiplying decimals together, add the total number of decimal places in both numbers and\u00A0put\u00A0the total number of decimal places in the answer.
In this case, there is one decimal place in 1.5 and two decimal places in 2.25 for a total of 3 decimal places. Add these to 3,375 to get 3.375.\u00A0