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You can often get advantages in cleverly joining or combining algorithms. You mark these combinations with parentheses and these will then be calculated first. When adding or multiplying, parentheses are enough but when subtracting and dividing the mathematical procedure has to be inverted. (Inversion: subtraction à addition; division à multiplication)

Examples:

1.      263 + 476 + 124
= 263 + (476 + 124)
= 263 + 600
= 863

2.      8 · 4 · 25
= 8 · (4 · 25)
= 8 · 100
= 800

3.      433 - 96 - 37
= 433 - (96 + 37)
= 433 - 133
= 300 

4.      42 : 2 : 3
= 42 : (2 · 3)
= 42 : 6
= 7

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02/09/07