What Is Expanded Form in Math? Definition, Examples, Facts - SplashLearn Definition of the Expanded Form. In the expanded form. We break up a number according to its place value and expand it to show the value of each digit. For example, the expanded form of 943 is given. 9 blocks of hundreds 4 blocks of tens 3 blocks of ones. 9 hundreds 4 tens 3 ones expanded Form: 900 + 40 + 3.