Step-by-step explanation: 2.5x3.5=8.75. An easy way to multiply decimals is to ignore the decimal entirely. So we would multiply 25 and 35 to get 875, but we still have decimals. To find where to place a decimal, look at both of the factors. The decimal in both factors are over to the left by one, so we add how many decimals are over to the left. That leads us with a decimal that goes to the left 2 times.