Problem. Lego pieces.

Mario and Arthur play with lego pieces. In the box there are 22 lego pieces. Mario puts 18 lego pieces in the box, and Arthur removes 21 lego pieces from the box. How many lego pieces are in the box?

Fill in here

Exemple !

Mario and Arthur play with lego pieces. In the box there are 20 lego pieces. Mario puts 15 lego pieces in the box, and Arthur removes 19 lego pieces from the box. How many lego pieces are in the box?

20 + 15 - 19 = 35 -19 = 16

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