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Placard outside a shop in Bordeaux advertising subtraction of 20% from the price of the second perfume purchased.
Placard outside a shop in Bordeaux advertising subtraction of 20% from the price of the second perfume purchased.
1 + ... = 3
1 + ... = 3
The difference is written under the line.
The difference is written under the line.
9 + ... = 5 The required sum (5) is too small.
9 + ... = 5 The required sum (5) is too small.
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From Johannes Widmann's book on "handy and pretty arithmetic for all merchants"
From Johannes Widmann's book on "handy and pretty arithmetic for all merchants"