We want to divide two decimal numbers. The calculations are easier if we multiply the divisor and the dividend by the same power of 10 so that the divisor is a whole number. In this case, we will multiply by 10.
12.2* 10 &= 122
0.4* 10 &= 4This means that 12.2Ă· 0.4 is the same as 122Ă· 4. Let's make a rough estimation for our division. We can round 122 to 120.
120Ă· 4=30
Our quotient should be about 30. Now we will find the exact quotient. We divide, multiply, subtract, and compare as many times as we need.
Since 122Ă· 4=30.5, we know that 12.2Ă· 0.4=30.5. We know that the answer is reasonable because 30.5 is close to our estimate.
