For standard form, the decimal point must be after the first non-zero digit In 625.13 , the first non-zero digit is 6 , hence we must move the decimal point to the front of 6 Step 1 Count while moving the decimal point. 6. 2 5.13=6.2513 with two moves Step 2 Multiply the new decimal by 10n Where n is the number of times you have to move the decimal point If you move the decimal point to the left, n is positive but if you move to the right n is negative. In 625.13 , we have to move the decimal point two times to the left, hence n=2 Standard form of 625.13=6.2513×102