B Set 99 Unknown

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        "subject": "arithmetic",
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            {
                "id": 1,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 5.3,
                "operand2": 2.8,
                "question": "5.3 × 2.8 = ?",
                "answer": 14.84,
                "correctAnswer": "14.84",
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            },
            {
                "id": 2,
                "type": "decimals",
                "subType": "divide",
                "operand1": 99,
                "operand2": 9,
                "question": "99.0 ÷ 9 = ?",
                "answer": 11,
                "correctAnswer": "11",
                "difficulty": "normal"
            },
            {
                "id": 3,
                "type": "decimals",
                "subType": "add",
                "operand1": 3.2,
                "operand2": 12.3,
                "question": "3.2 + 12.3 = ?",
                "answer": 15.5,
                "correctAnswer": "15.5",
                "difficulty": "normal"
            },
            {
                "id": 4,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 11.1,
                "operand2": 1.4,
                "question": "11.1 × 1.4 = ?",
                "answer": 15.54,
                "correctAnswer": "15.54",
                "difficulty": "normal"
            },
            {
                "id": 5,
                "type": "decimals",
                "subType": "add",
                "operand1": 7.7,
                "operand2": 7.3,
                "question": "7.7 + 7.3 = ?",
                "answer": 15,
                "correctAnswer": "15",
                "difficulty": "normal"
            },
            {
                "id": 6,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 18.3,
                "operand2": 11.8,
                "question": "18.3 - 11.8 = ?",
                "answer": 6.5,
                "correctAnswer": "6.5",
                "difficulty": "normal"
            },
            {
                "id": 7,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 13.8,
                "operand2": 8.4,
                "question": "13.8 - 8.4 = ?",
                "answer": 5.4,
                "correctAnswer": "5.4",
                "difficulty": "normal"
            },
            {
                "id": 8,
                "type": "decimals",
                "subType": "add",
                "operand1": 14.8,
                "operand2": 2.3,
                "question": "14.8 + 2.3 = ?",
                "answer": 17.1,
                "correctAnswer": "17.1",
                "difficulty": "normal"
            },
            {
                "id": 9,
                "type": "decimals",
                "subType": "add",
                "operand1": 4.9,
                "operand2": 2.9,
                "question": "4.9 + 2.9 = ?",
                "answer": 7.8,
                "correctAnswer": "7.8",
                "difficulty": "normal"
            },
            {
                "id": 10,
                "type": "decimals",
                "subType": "divide",
                "operand1": 60,
                "operand2": 10,
                "question": "60.0 ÷ 10 = ?",
                "answer": 6,
                "correctAnswer": "6",
                "difficulty": "normal"
            },
            {
                "id": 11,
                "type": "decimals",
                "subType": "add",
                "operand1": 7.2,
                "operand2": 5.1,
                "question": "7.2 + 5.1 = ?",
                "answer": 12.3,
                "correctAnswer": "12.3",
                "difficulty": "normal"
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            {
                "id": 12,
                "type": "decimals",
                "subType": "divide",
                "operand1": 12.6,
                "operand2": 6,
                "question": "12.6 ÷ 6 = ?",
                "answer": 2.1,
                "correctAnswer": "2.1",
                "difficulty": "normal"
            },
            {
                "id": 13,
                "type": "decimals",
                "subType": "divide",
                "operand1": 69.2,
                "operand2": 4,
                "question": "69.2 ÷ 4 = ?",
                "answer": 17.3,
                "correctAnswer": "17.3",
                "difficulty": "normal"
            },
            {
                "id": 14,
                "type": "decimals",
                "subType": "subtract",
                "operand1": 18.6,
                "operand2": 7.2,
                "question": "18.6 - 7.2 = ?",
                "answer": 11.4,
                "correctAnswer": "11.4",
                "difficulty": "normal"
            },
            {
                "id": 15,
                "type": "decimals",
                "subType": "add",
                "operand1": 1.1,
                "operand2": 13.7,
                "question": "1.1 + 13.7 = ?",
                "answer": 14.8,
                "correctAnswer": "14.8",
                "difficulty": "normal"
            },
            {
                "id": 16,
                "type": "decimals",
                "subType": "divide",
                "operand1": 44,
                "operand2": 5,
                "question": "44.0 ÷ 5 = ?",
                "answer": 8.8,
                "correctAnswer": "8.8",
                "difficulty": "normal"
            },
            {
                "id": 17,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 19.4,
                "operand2": 1.5,
                "question": "19.4 × 1.5 = ?",
                "answer": 29.1,
                "correctAnswer": "29.1",
                "difficulty": "normal"
            },
            {
                "id": 18,
                "type": "decimals",
                "subType": "multiply",
                "operand1": 4.1,
                "operand2": 4.3,
                "question": "4.1 × 4.3 = ?",
                "answer": 17.63,
                "correctAnswer": "17.63",
                "difficulty": "normal"
            },
            {
                "id": 19,
                "type": "decimals",
                "subType": "divide",
                "operand1": 45.5,
                "operand2": 5,
                "question": "45.5 ÷ 5 = ?",
                "answer": 9.1,
                "correctAnswer": "9.1",
                "difficulty": "normal"
            },
            {
                "id": 20,
                "type": "decimals",
                "subType": "divide",
                "operand1": 132,
                "operand2": 8,
                "question": "132.0 ÷ 8 = ?",
                "answer": 16.5,
                "correctAnswer": "16.5",
                "difficulty": "normal"
            }
        ],
        "layout": {
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    "_archetype": "form-exercise",
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