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「數感​」例題

29 + 56 + 71

=29 + 71 + 56

=100+56

=156

62 – 37 + 17

= 62 + 17 – 37

=79 – 37

=42

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25 × 17 × 4

= 25 × 4 × 17

=100 × 17

=1700

22000 ÷ 25

= (22000 × 4) ÷ (25 × 4)

=88000 ÷ 100

=880

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