Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 81 - Math Genius C2
P. 81

    E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_04
                   \ 26-Sep-2025  Bharat Arora   Proof-10                                   Reader’s Sign _______________________ Date __________

                  Step 3.  Now, subtract the hundreds.

                  7 – 2 = 5 hundreds
                                                                                              Get it right!
                                  H    t   O
                                       8   13                                              H T O             H T O
                                                                                                                7 15
                                  7    9    3                                              4 8 5             4 8 5
                              –   2    4    6                                            –  2 1 9          –  2 1 9

                                  5    4    7                                              2 7 4      7      2 6 6     3

                  Thus, 793 – 246 = 547.
                  regrouping hundreds

                  We know that 1 hundred = 10 tens.

                  So, we borrow 1 hundred from the hundreds place when there are not enough tens
                  to subtract from in the tens place.

                  Let us understand this with an example.
                  Example 2: Find: 428 – 182.
                  Solution:

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

                              8 – 2 = 6 ones                                           H    t   O

                                        H    t    O                                    3   12
                                                                                       4    2    8

                                        4    2    8                                –   1    8    2
                                    –   1    8    2                                         4    6

                                                  6                    Since 2 < 8, regroup.
                                                                       4 hundreds + 2 tens
                                                                                           = 3 hundreds + 12 tens

                                                                                  12 – 8 = 4 tens
                   Step 3.  Subtract the hundreds.

                              3 – 1 = 2 hundreds                       Think Tank                                Critical Thinking
                                                                     Put the least digit in the blanks so that
                                  H     t   O                        you need to regroup and subtract.
                                   3   12                            1.  Tens into ones        2.  Hundreds into tens

                                   4    2    8                             H T O                    H T O
                               –   1    8    2                             7 5 6                     4 2 8
                                   2    4    6                           –  5 2                   –  2     5

                             Thus, 428 – 182 = 246.

                  Mathematics-2                                                                                          79

| 76 77 78 79 80 81 82 83 84 85 86 |