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

                                   H    T O                                                H   T O
                                   5    7   8                                              5   7    8

                               –    1   2   6                                         –    1   2    6

                                        5    2                                             4   5    2

                              7 – 2 = 5 tens                                         5 – 1 = 4 hundreds

                    So, 578 – 126 = 452.

                    Subtraction with regrouping

                    regrouping tens to ones

                    If there are not enough ones in subtraction, we regroup 1 ten to 10 ones.

                                           T O              T O                                     T O              T O

                                            1   0           1  10 0                                 2    4          1 2  14 4

                      1 ten       10 ones              24                                1 ten 14 ones

                    Example 2. Subtract 148 from 364.

                    Solution.

                    Step 1. Subtract the ones.

                                 H    T O

                                      5   14
                                 3    6   4

                             –   1    4   8

                                          6

                    8 ones cannot be subtracted from 4 ones.

                    So, regroup tens and ones.

                    6 tens 4 ones = 5 tens 14 ones

                    Now, 14 – 8 = 6 ones.

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                                                                                                  Subtraction

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