{"id":"fraction-calculator","engine":"core","category":"math","name":"Calcul exact de fractions","fields":[{"key":"a","label":"a","type":"text","default":"2/3","required":true},{"key":"b","label":"b","type":"text","default":"3/4","required":true},{"key":"operation","label":"Opération","type":"select","default":"add","options":[{"value":"add","label":"Additionner"},{"value":"subtract","label":"Soustraire"},{"value":"multiply","label":"Multiplier"},{"value":"divide","label":"Diviser"}]}],"sample":{"a":"2/3","b":"3/4","operation":"add"}}