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    Step 3. Subtract the hundreds.
                                                                                     H    T O
                             1 – 1 = 0 hundreds
                                                                                      1  13
                    So, 239 – 173 = 66.
                                                                                     2    3   9

                                                                                 –   1    7   3

                                                                                     0 6      6

                    regrouping both Hundreds and tens

                    Example 4. Subtract 267 from 421.                                       H    T O

                    Solution.                                                                    1   11

                    Step 1. Subtract the ones.                                              4    2   1
                    1 one < 7 ones, so, regroup tens and ones.                          –   2    6   7
                    2 tens 1 one = 1 ten 11 ones
                                                                                                     4
                    Now, 11 – 7 = 4 ones.

                    Step 2. Subtract the tens.                                Step 3. Subtract the hundreds.

                                      H   T O                                               H   T O

                                          11                                                    11

                                      3    1   11                                           3    1   11
                                      4   2    1                                            4   2    1

                                 –    2   6    7                                       –    2   6    7

                                          5    4                                            1   5    4

                    1 ten < 6 tens, so, regroup hundreds and tens.                   3 – 2 = 1 hundred
                    4 hundreds 1 ten = 3 hundreds 11 tens
                    Now, 11 – 6 = 5 tens.

                    So, 421 – 267 = 154.

                    Subtraction with Zeros

                    Example 5. Subtract 268 from 500.                                                           H    T O
                    Solution.                                                                                        9

                    Step 1. Subtract the ones.                                                                  4 10 10
                    8 ones cannot be subtracted from 0 ones. So, regroup tens and                               5 0 0
                    ones. But there are no tens. So, first regroup hundreds and tens
                    and then tens and ones. 5 hundreds 0 tens = 4 hundreds 10 tens                          –   2   6    8

                    10 tens 0 ones = 9 tens 10 ones. Now, 10 – 8 = 2 ones.                                               2

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                                                                                                  Subtraction

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