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

                       H    T O                                               H    T O

                            5   14                                                 5   14

                        3   6   4                                             3    6   4
                   –    1   4   8                                         –    1   4   8

                            1   6                                             2    1   6

                5 – 4 = 1 ten                                           3 – 1 = 2 hundreds

                So, 364 – 148 = 216.

                regrouping Hundreds to tens

                If there are not enough tens for subtraction,

                we regroup 1 hundred to 10 tens.

                                                                                        H    T O             H   T O

                                                                                                            1   12
                                                                                         2   2   0           2   2    0
                    2 hundreds 2 tens                    1 hundred 12 tens

                Example 3. Subtract 173 from 239.

                Solution.
                Step 1. Subtract the ones.                              Step 2. Subtract the tens.

                      H    T O                                        H    T O

                      2    3   9                                       1   13

                  –    1   7   3                                      2    3   9

                               6                                  –    1   7   3

                                                                           6   6

                9 – 3 = 6 ones                                      7 tens cannot be subtracted from 3 tens.

                                                                    So, regroup hundreds and tens.
                                                                    2 hundreds 3 tens = 1 hundred 13 tens

                                                                    Now, 13 – 7 = 6 tens.

                       58        Mathematics 3

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